diff --git a/src/components/FavoriteRelaysSetting/AddBlockedRelay.tsx b/src/components/FavoriteRelaysSetting/AddBlockedRelay.tsx
new file mode 100644
index 0000000..fd65292
--- /dev/null
+++ b/src/components/FavoriteRelaysSetting/AddBlockedRelay.tsx
@@ -0,0 +1,94 @@
+import { normalizeUrl } from '@/lib/url'
+import { useFavoriteRelays } from '@/providers/FavoriteRelaysProvider'
+import { useState } from 'react'
+import { useTranslation } from 'react-i18next'
+import { Button } from '../ui/button'
+import { Input } from '../ui/input'
+import { Loader2, Check } from 'lucide-react'
+
+export default function AddBlockedRelay() {
+  const { t } = useTranslation()
+  const { blockedRelays, addBlockedRelays } = useFavoriteRelays()
+  const [input, setInput] = useState('')
+  const [errorMsg, setErrorMsg] = useState('')
+  const [successMsg, setSuccessMsg] = useState('')
+  const [isLoading, setIsLoading] = useState(false)
+
+  const saveRelay = async () => {
+    if (!input || isLoading) return
+    const normalizedUrl = normalizeUrl(input)
+    if (!normalizedUrl) {
+      setErrorMsg(t('Invalid URL'))
+      setSuccessMsg('')
+      return
+    }
+    if (blockedRelays.includes(normalizedUrl)) {
+      setErrorMsg(t('Already blocked'))
+      setSuccessMsg('')
+      return
+    }
+
+    setIsLoading(true)
+    setErrorMsg('')
+    setSuccessMsg('')
+
+    try {
+      await addBlockedRelays([normalizedUrl])
+      setInput('')
+      setSuccessMsg(t('Relay blocked successfully'))
+      setTimeout(() => setSuccessMsg(''), 3000)
+    } catch (error) {
+      console.error('Failed to block relay:', error)
+      setErrorMsg(t('Failed to block relay. Please try again.'))
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  const handleNewRelayInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setInput(e.target.value)
+    setErrorMsg('')
+    setSuccessMsg('')
+  }
+
+  const handleNewRelayInputKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
+    if (e.key === 'Enter') {
+      e.preventDefault()
+      saveRelay()
+    }
+  }
+
+  return (
+    <div className="space-y-1">
+      <div className="text-muted-foreground font-semibold select-none">{t('Block Relay')}</div>
+      <div className="flex gap-2 items-center">
+        <Input
+          placeholder={t('Add a relay to block')}
+          value={input}
+          onChange={handleNewRelayInputChange}
+          onKeyDown={handleNewRelayInputKeyDown}
+          className={errorMsg ? 'border-destructive' : successMsg ? 'border-green-500' : ''}
+          disabled={isLoading}
+        />
+        <Button onClick={saveRelay} disabled={isLoading || !input.trim()}>
+          {isLoading ? (
+            <>
+              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+              {t('Blocking...')}
+            </>
+          ) : (
+            t('Block')
+          )}
+        </Button>
+      </div>
+      {errorMsg && <div className="text-destructive text-sm pl-8">{errorMsg}</div>}
+      {successMsg && (
+        <div className="text-green-600 dark:text-green-400 text-sm pl-8 flex items-center gap-1">
+          <Check className="h-3 w-3" />
+          {successMsg}
+        </div>
+      )}
+    </div>
+  )
+}
+
diff --git a/src/components/FavoriteRelaysSetting/BlockedRelayItem.tsx b/src/components/FavoriteRelaysSetting/BlockedRelayItem.tsx
new file mode 100644
index 0000000..4144c2b
--- /dev/null
+++ b/src/components/FavoriteRelaysSetting/BlockedRelayItem.tsx
@@ -0,0 +1,53 @@
+import { toRelay } from '@/lib/link'
+import { useSecondaryPage } from '@/PageManager'
+import { useFavoriteRelays } from '@/providers/FavoriteRelaysProvider'
+import { X, Loader2 } from 'lucide-react'
+import { useState } from 'react'
+import RelayIcon from '../RelayIcon'
+import { Button } from '../ui/button'
+
+export default function BlockedRelayItem({ relay }: { relay: string }) {
+  const { push } = useSecondaryPage()
+  const { deleteBlockedRelays } = useFavoriteRelays()
+  const [isLoading, setIsLoading] = useState(false)
+
+  const handleUnblock = async (e: React.MouseEvent) => {
+    e.stopPropagation()
+    if (isLoading) return
+
+    setIsLoading(true)
+    try {
+      await deleteBlockedRelays([relay])
+    } catch (error) {
+      console.error('Failed to unblock relay:', error)
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  return (
+    <div
+      className="relative group clickable flex gap-2 border rounded-lg p-2 pr-2.5 items-center justify-between select-none"
+      onClick={() => push(toRelay(relay))}
+    >
+      <div className="flex items-center gap-2 flex-1">
+        <RelayIcon url={relay} />
+        <div className="flex-1 w-0 truncate font-semibold">{relay}</div>
+      </div>
+      <Button
+        variant="ghost"
+        size="sm"
+        onClick={handleUnblock}
+        disabled={isLoading}
+        className="h-8 w-8 p-0"
+      >
+        {isLoading ? (
+          <Loader2 className="h-4 w-4 animate-spin" />
+        ) : (
+          <X className="h-4 w-4" />
+        )}
+      </Button>
+    </div>
+  )
+}
+
diff --git a/src/components/FavoriteRelaysSetting/BlockedRelayList.tsx b/src/components/FavoriteRelaysSetting/BlockedRelayList.tsx
new file mode 100644
index 0000000..4b5ff43
--- /dev/null
+++ b/src/components/FavoriteRelaysSetting/BlockedRelayList.tsx
@@ -0,0 +1,24 @@
+import { useFavoriteRelays } from '@/providers/FavoriteRelaysProvider'
+import { useTranslation } from 'react-i18next'
+import BlockedRelayItem from './BlockedRelayItem'
+
+export default function BlockedRelayList() {
+  const { t } = useTranslation()
+  const { blockedRelays } = useFavoriteRelays()
+
+  if (blockedRelays.length === 0) {
+    return null
+  }
+
+  return (
+    <div className="space-y-2">
+      <div className="text-muted-foreground font-semibold select-none">{t('Blocked Relays')}</div>
+      <div className="grid gap-2">
+        {blockedRelays.map((relay) => (
+          <BlockedRelayItem key={relay} relay={relay} />
+        ))}
+      </div>
+    </div>
+  )
+}
+
diff --git a/src/components/FavoriteRelaysSetting/index.tsx b/src/components/FavoriteRelaysSetting/index.tsx
index 6944088..cb6934c 100644
--- a/src/components/FavoriteRelaysSetting/index.tsx
+++ b/src/components/FavoriteRelaysSetting/index.tsx
@@ -1,5 +1,7 @@
+import AddBlockedRelay from './AddBlockedRelay'
 import AddNewRelay from './AddNewRelay'
 import AddNewRelaySet from './AddNewRelaySet'
+import BlockedRelayList from './BlockedRelayList'
 import FavoriteRelayList from './FavoriteRelayList'
 import { RelaySetsSettingComponentProvider } from './provider'
 import RelaySetList from './RelaySetList'
@@ -12,6 +14,8 @@ export default function FavoriteRelaysSetting() {
         <AddNewRelaySet />
         <FavoriteRelayList />
         <AddNewRelay />
+        <BlockedRelayList />
+        <AddBlockedRelay />
       </div>
     </RelaySetsSettingComponentProvider>
   )
diff --git a/src/components/MailboxSetting/DiscoveredRelays.tsx b/src/components/MailboxSetting/DiscoveredRelays.tsx
new file mode 100644
index 0000000..90b6715
--- /dev/null
+++ b/src/components/MailboxSetting/DiscoveredRelays.tsx
@@ -0,0 +1,242 @@
+import { Button } from '@/components/ui/button'
+import { Checkbox } from '@/components/ui/checkbox'
+import { normalizeUrl } from '@/lib/url'
+import { getRelaysFromNip07Extension, verifyNip05 } from '@/lib/nip05'
+import { useNostr } from '@/providers/NostrProvider'
+import { TMailboxRelay } from '@/types'
+import { Loader2, Check, AlertCircle } from 'lucide-react'
+import { useEffect, useState } from 'react'
+import { useTranslation } from 'react-i18next'
+import RelayIcon from '../RelayIcon'
+
+interface DiscoveredRelay {
+  url: string
+  source: 'nip05' | 'nip07' | 'bunker'
+  selected: boolean
+}
+
+export default function DiscoveredRelays({ onAdd }: { onAdd: (relays: TMailboxRelay[]) => void }) {
+  const { t } = useTranslation()
+  const { profile, account } = useNostr()
+  const [discoveredRelays, setDiscoveredRelays] = useState<DiscoveredRelay[]>([])
+  const [isLoading, setIsLoading] = useState(false)
+  const [isAdding, setIsAdding] = useState(false)
+  const [successMsg, setSuccessMsg] = useState('')
+  const [errorMsg, setErrorMsg] = useState('')
+
+  useEffect(() => {
+    discoverRelays()
+  }, [profile?.nip05, account?.pubkey, account?.signerType])
+
+  const discoverRelays = async () => {
+    if (!account?.pubkey) return
+
+    setIsLoading(true)
+    setErrorMsg('')
+    const discovered = new Map<string, DiscoveredRelay>()
+
+    try {
+      // Try to get relays from NIP-05
+      if (profile?.nip05) {
+        try {
+          const nip05Result = await verifyNip05(profile.nip05, account.pubkey)
+          if (nip05Result.isVerified && nip05Result.relays) {
+            nip05Result.relays.forEach(url => {
+              const normalized = normalizeUrl(url)
+              if (normalized && !discovered.has(normalized)) {
+                discovered.set(normalized, {
+                  url: normalized,
+                  source: 'nip05',
+                  selected: true
+                })
+              }
+            })
+          }
+        } catch (error) {
+          console.log('Could not fetch relays from NIP-05:', error)
+        }
+      }
+
+      // Try to get relays from NIP-07 extension
+      if (account.signerType === 'nip-07') {
+        try {
+          const extensionRelays = await getRelaysFromNip07Extension()
+          extensionRelays.forEach(url => {
+            const normalized = normalizeUrl(url)
+            if (normalized && !discovered.has(normalized)) {
+              discovered.set(normalized, {
+                url: normalized,
+                source: 'nip07',
+                selected: true
+              })
+            }
+          })
+        } catch (error) {
+          console.log('Could not fetch relays from NIP-07 extension:', error)
+        }
+      }
+
+      // Note: Bunker relays are from the bunker connection URL itself
+      // We could add logic here to extract relays from the bunker URL if needed
+
+      setDiscoveredRelays(Array.from(discovered.values()))
+    } catch (error) {
+      console.error('Error discovering relays:', error)
+      setErrorMsg(t('Failed to discover relays'))
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  const handleToggleRelay = (url: string) => {
+    setDiscoveredRelays(prev =>
+      prev.map(relay =>
+        relay.url === url ? { ...relay, selected: !relay.selected } : relay
+      )
+    )
+  }
+
+  const handleSelectAll = () => {
+    setDiscoveredRelays(prev => prev.map(relay => ({ ...relay, selected: true })))
+  }
+
+  const handleClearAll = () => {
+    setDiscoveredRelays(prev => prev.map(relay => ({ ...relay, selected: false })))
+  }
+
+  const handleAddSelected = async () => {
+    const selectedRelays = discoveredRelays.filter(r => r.selected)
+    if (selectedRelays.length === 0) return
+
+    setIsAdding(true)
+    setErrorMsg('')
+    setSuccessMsg('')
+
+    try {
+      const mailboxRelays: TMailboxRelay[] = selectedRelays.map(relay => ({
+        url: relay.url,
+        scope: 'both' as const
+      }))
+
+      onAdd(mailboxRelays)
+      setSuccessMsg(t('Added {{count}} relay(s)', { count: selectedRelays.length }))
+      setTimeout(() => setSuccessMsg(''), 3000)
+      
+      // Clear discovered relays after adding
+      setDiscoveredRelays([])
+    } catch (error) {
+      console.error('Failed to add relays:', error)
+      setErrorMsg(t('Failed to add relays'))
+    } finally {
+      setIsAdding(false)
+    }
+  }
+
+  const getSourceLabel = (source: DiscoveredRelay['source']) => {
+    switch (source) {
+      case 'nip05':
+        return t('from NIP-05')
+      case 'nip07':
+        return t('from Extension')
+      case 'bunker':
+        return t('from Bunker')
+    }
+  }
+
+  if (!profile || !account) {
+    return null
+  }
+
+  if (isLoading) {
+    return (
+      <div className="space-y-2">
+        <div className="text-muted-foreground font-semibold select-none">{t('Discovered Relays')}</div>
+        <div className="flex items-center justify-center py-8 text-muted-foreground">
+          <Loader2 className="h-5 w-5 animate-spin mr-2" />
+          {t('Discovering relays...')}
+        </div>
+      </div>
+    )
+  }
+
+  if (discoveredRelays.length === 0) {
+    return null
+  }
+
+  const selectedCount = discoveredRelays.filter(r => r.selected).length
+
+  return (
+    <div className="space-y-2">
+      <div className="flex items-center justify-between">
+        <div className="text-muted-foreground font-semibold select-none">{t('Discovered Relays')}</div>
+        <Button variant="ghost" size="sm" onClick={discoverRelays}>
+          {t('Refresh')}
+        </Button>
+      </div>
+
+      <div className="text-sm text-muted-foreground mb-2">
+        {t('These relays were found from your NIP-05 identifier and signer. You can add them to your relay list.')}
+      </div>
+
+      <div className="border rounded-lg p-3 space-y-2 max-h-96 overflow-y-auto">
+        {discoveredRelays.map((relay) => (
+          <div key={relay.url} className="flex items-center gap-2 p-2 hover:bg-accent rounded">
+            <Checkbox
+              id={`discovered-${relay.url}`}
+              checked={relay.selected}
+              onCheckedChange={() => handleToggleRelay(relay.url)}
+            />
+            <label
+              htmlFor={`discovered-${relay.url}`}
+              className="flex items-center gap-2 flex-1 cursor-pointer"
+            >
+              <RelayIcon url={relay.url} className="w-4 h-4 shrink-0" />
+              <div className="flex-1 min-w-0">
+                <div className="truncate text-sm font-medium">{relay.url}</div>
+                <div className="text-xs text-muted-foreground">{getSourceLabel(relay.source)}</div>
+              </div>
+            </label>
+          </div>
+        ))}
+      </div>
+
+      <div className="flex items-center justify-between gap-2 pt-2">
+        <div className="flex gap-2">
+          <Button variant="ghost" size="sm" onClick={handleSelectAll}>
+            {t('Select All')}
+          </Button>
+          <Button variant="ghost" size="sm" onClick={handleClearAll}>
+            {t('Clear All')}
+          </Button>
+        </div>
+        <Button
+          onClick={handleAddSelected}
+          disabled={selectedCount === 0 || isAdding}
+        >
+          {isAdding ? (
+            <>
+              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+              {t('Adding...')}
+            </>
+          ) : (
+            t('Add {{count}} Selected', { count: selectedCount })
+          )}
+        </Button>
+      </div>
+
+      {successMsg && (
+        <div className="text-green-600 dark:text-green-400 text-sm flex items-center gap-1">
+          <Check className="h-3 w-3" />
+          {successMsg}
+        </div>
+      )}
+      {errorMsg && (
+        <div className="text-destructive text-sm flex items-center gap-1">
+          <AlertCircle className="h-3 w-3" />
+          {errorMsg}
+        </div>
+      )}
+    </div>
+  )
+}
+
diff --git a/src/components/MailboxSetting/index.tsx b/src/components/MailboxSetting/index.tsx
index 0746925..74783ab 100644
--- a/src/components/MailboxSetting/index.tsx
+++ b/src/components/MailboxSetting/index.tsx
@@ -25,6 +25,7 @@ import MailboxRelay from './MailboxRelay'
 import NewMailboxRelayInput from './NewMailboxRelayInput'
 import RelayCountWarning from './RelayCountWarning'
 import SaveButton from './SaveButton'
+import DiscoveredRelays from './DiscoveredRelays'
 
 export default function MailboxSetting() {
   const { t } = useTranslation()
@@ -107,6 +108,16 @@ export default function MailboxSetting() {
     return null
   }
 
+  const handleAddDiscoveredRelays = (newRelays: TMailboxRelay[]) => {
+    const relaysToAdd = newRelays.filter(
+      newRelay => !relays.some(r => r.url === newRelay.url)
+    )
+    if (relaysToAdd.length > 0) {
+      setRelays([...relays, ...relaysToAdd])
+      setHasChange(true)
+    }
+  }
+
   return (
     <div className="space-y-4">
       <div className="text-xs text-muted-foreground space-y-1">
@@ -114,6 +125,7 @@ export default function MailboxSetting() {
         <div>{t('write relays description')}</div>
         <div>{t('read & write relays notice')}</div>
       </div>
+      <DiscoveredRelays onAdd={handleAddDiscoveredRelays} />
       <RelayCountWarning relays={relays} />
       <SaveButton mailboxRelays={relays} hasChange={hasChange} setHasChange={setHasChange} />
       <DndContext
diff --git a/src/components/PostEditor/PostContent.tsx b/src/components/PostEditor/PostContent.tsx
index 8d007aa..9c0d6bc 100644
--- a/src/components/PostEditor/PostContent.tsx
+++ b/src/components/PostEditor/PostContent.tsx
@@ -62,7 +62,6 @@ export default function PostContent({
   const [publicMessageRecipients, setPublicMessageRecipients] = useState<string[]>([])
   const [isProtectedEvent, setIsProtectedEvent] = useState(false)
   const [additionalRelayUrls, setAdditionalRelayUrls] = useState<string[]>([])
-  const [userWriteRelays, setUserWriteRelays] = useState<string[]>([])
   const [isHighlight, setIsHighlight] = useState(false)
   const [highlightData, setHighlightData] = useState<HighlightData>({
     sourceType: 'nostr',
@@ -247,7 +246,7 @@ export default function PostContent({
 
         // console.log('Publishing draft event:', draftEvent)
         const newEvent = await publish(draftEvent, {
-          specifiedRelayUrls: isProtectedEvent ? additionalRelayUrls.filter(url => !userWriteRelays.includes(url)) : undefined,
+          specifiedRelayUrls: additionalRelayUrls.length > 0 ? additionalRelayUrls : undefined,
           additionalRelayUrls: isPoll ? pollCreateData.relays : additionalRelayUrls,
           minPow
         })
@@ -256,9 +255,7 @@ export default function PostContent({
         // Check if we need to refresh the current relay view
         if (feedInfo.feedType === 'relay' && feedInfo.id) {
           const currentRelayUrl = normalizeUrl(feedInfo.id)
-          const publishedRelays = isProtectedEvent 
-            ? additionalRelayUrls.filter(url => !userWriteRelays.includes(url))
-            : additionalRelayUrls
+          const publishedRelays = additionalRelayUrls
           
           // If we published to the current relay being viewed, trigger a refresh after a short delay
           if (publishedRelays.some(url => normalizeUrl(url) === currentRelayUrl)) {
@@ -492,10 +489,10 @@ export default function PostContent({
         <PostRelaySelector
           setIsProtectedEvent={setIsProtectedEvent}
           setAdditionalRelayUrls={setAdditionalRelayUrls}
-          setUserWriteRelays={setUserWriteRelays}
           parentEvent={parentEvent}
           openFrom={openFrom}
           content={text}
+          isPublicMessage={isPublicMessage}
         />
       )}
       <div className="flex items-center justify-between">
diff --git a/src/components/PostEditor/PostRelaySelector.tsx b/src/components/PostEditor/PostRelaySelector.tsx
index 9569426..142f45f 100644
--- a/src/components/PostEditor/PostRelaySelector.tsx
+++ b/src/components/PostEditor/PostRelaySelector.tsx
@@ -1,13 +1,3 @@
-import { Button } from '@/components/ui/button'
-import { Drawer, DrawerContent, DrawerOverlay } from '@/components/ui/drawer'
-import {
-  DropdownMenu,
-  DropdownMenuContent,
-  DropdownMenuTrigger
-} from '@/components/ui/dropdown-menu'
-import { ExtendedKind } from '@/constants'
-import client from '@/services/client.service'
-import { isWebsocketUrl, normalizeUrl } from '@/lib/url'
 import { simplifyUrl } from '@/lib/url'
 import { useCurrentRelays } from '@/providers/CurrentRelaysProvider'
 import { useFavoriteRelays } from '@/providers/FavoriteRelaysProvider'
@@ -15,308 +5,167 @@ import { useScreenSize } from '@/providers/ScreenSizeProvider'
 import { useNostr } from '@/providers/NostrProvider'
 import { Check } from 'lucide-react'
 import { NostrEvent } from 'nostr-tools'
-import { Dispatch, SetStateAction, useCallback, useEffect, useMemo, useState } from 'react'
+import { Dispatch, SetStateAction, useCallback, useEffect, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import RelayIcon from '../RelayIcon'
-import { extractMentions } from './Mentions'
+import relaySelectionService from '@/services/relay-selection.service'
 
 export default function PostRelaySelector({
   parentEvent: _parentEvent,
   openFrom,
   setIsProtectedEvent,
   setAdditionalRelayUrls,
-  setUserWriteRelays,
-  content: postContent = ''
+  content: postContent = '',
+  isPublicMessage = false
 }: {
   parentEvent?: NostrEvent
   openFrom?: string[]
   setIsProtectedEvent: Dispatch<SetStateAction<boolean>>
   setAdditionalRelayUrls: Dispatch<SetStateAction<string[]>>
-  setUserWriteRelays?: Dispatch<SetStateAction<string[]>>
   content?: string
+  isPublicMessage?: boolean
 }) {
   const { t } = useTranslation()
   const { isSmallScreen } = useScreenSize()
-  const [isDrawerOpen, setIsDrawerOpen] = useState(false)
   const { relayUrls } = useCurrentRelays()
-  const { relaySets, favoriteRelays } = useFavoriteRelays()
-  const { pubkey } = useNostr()
+  const { relaySets, favoriteRelays, blockedRelays } = useFavoriteRelays()
+  const { pubkey, relayList } = useNostr()
   const [selectedRelayUrls, setSelectedRelayUrls] = useState<string[]>([])
-  const [mentionRelays, setMentionRelays] = useState<string[]>([])
-  
-  // Fetch mention relays for regular replies (not discussion replies)
-  const isRegularReply = useMemo(() => {
-    if (!_parentEvent) return false
-    // Kind 1 or Kind 1111 that is not a reply to Kind 11 (discussion)
-    return (_parentEvent.kind === 1 || _parentEvent.kind === ExtendedKind.COMMENT) && 
-           _parentEvent.kind !== ExtendedKind.DISCUSSION
-  }, [_parentEvent])
-  
-  // Get all selectable relays (write relays + favorite relays + relays from relay sets + mention relays)
-  const selectableRelays = useMemo(() => {
-    // Normalize all relay URLs before combining them
-    const normalizedRelays = [
-      ...relayUrls.map(url => normalizeUrl(url) || url),
-      ...favoriteRelays.map(url => normalizeUrl(url) || url),
-      ...relaySets.flatMap(set => set.relayUrls.map(url => normalizeUrl(url) || url)),
-      ...mentionRelays.map(url => normalizeUrl(url) || url)
-    ].filter(Boolean) // Remove any null/undefined values
-    
-    return Array.from(new Set(normalizedRelays))
-  }, [relayUrls, favoriteRelays, relaySets, mentionRelays])
-  
-  const description = useMemo(() => {
-    if (selectedRelayUrls.length === 0) {
-      return t('No relays selected')
-    }
-    if (selectedRelayUrls.length === 1) {
-      return simplifyUrl(selectedRelayUrls[0])
-    }
-    return t('{{count}} relays', { count: selectedRelayUrls.length })
-  }, [selectedRelayUrls])
+  const [selectableRelays, setSelectableRelays] = useState<string[]>([])
+  const [description, setDescription] = useState('')
+  const [isLoading, setIsLoading] = useState(true)
 
-  // Fetch mention relays when content changes for regular replies
+  // Use centralized relay selection service
   useEffect(() => {
-    if (!isRegularReply) {
-      setMentionRelays([])
-      return
-    }
-
-    const fetchMentionRelays = async () => {
+    const updateRelaySelection = async () => {
+      setIsLoading(true)
       try {
-        console.log('PostRelaySelector: extractMentions called with:', { postContent, parentEvent: _parentEvent?.id })
-        const { pubkeys, relatedPubkeys } = await extractMentions(postContent, _parentEvent)
-        console.log('PostRelaySelector: extractMentions returned:', { pubkeys, relatedPubkeys })
-        
-        // Combine all mentioned pubkeys and filter out current user's pubkey
-        const allMentionPubkeys = [...pubkeys, ...relatedPubkeys]
-        const filteredMentionPubkeys = allMentionPubkeys.filter(p => p !== pubkey)
-        console.log('PostRelaySelector: filtered mention pubkeys:', filteredMentionPubkeys)
-        
-        if (filteredMentionPubkeys.length === 0) {
-          setMentionRelays([])
-          return
-        }
-
-        // Fetch relay lists for all mentioned users (including parent event author)
-        console.log('PostRelaySelector: Fetching relays for pubkeys:', filteredMentionPubkeys)
-        const relayListPromises = filteredMentionPubkeys.map(async (pubkey) => {
-          try {
-            const relayList = await client.fetchRelayList(pubkey)
-            console.log(`PostRelaySelector: Fetched relays for ${pubkey}:`, relayList?.write || [])
-            return relayList?.write || []
-          } catch (error) {
-            console.warn(`Failed to fetch relay list for ${pubkey}:`, error)
-            return []
-          }
+        const result = await relaySelectionService.selectRelays({
+          userWriteRelays: relayList?.write || relayUrls,
+          userReadRelays: relayList?.read || [],
+          favoriteRelays,
+          blockedRelays,
+          relaySets,
+          parentEvent: _parentEvent,
+          isPublicMessage,
+          content: postContent,
+          userPubkey: pubkey || undefined,
+          openFrom
         })
 
-        const relayLists = await Promise.all(relayListPromises)
-        const allMentionRelays = relayLists.flat()
-        const uniqueMentionRelays = Array.from(new Set(allMentionRelays))
+        setSelectableRelays(result.selectableRelays)
+        setSelectedRelayUrls(result.selectedRelays)
+        setDescription(result.description)
         
-        console.log('PostRelaySelector: Setting mention relays:', uniqueMentionRelays)
-        setMentionRelays(uniqueMentionRelays)
+        console.log('PostRelaySelector: Updated relay selection:', result)
       } catch (error) {
-        console.error('Error fetching mention relays:', error)
-        setMentionRelays([])
+        console.error('Failed to update relay selection:', error)
+        setSelectableRelays([])
+        setSelectedRelayUrls([])
+        setDescription('No relays selected')
+      } finally {
+        setIsLoading(false)
       }
     }
 
-    // Debounce the fetch
-    const timeoutId = setTimeout(fetchMentionRelays, 300)
-    return () => clearTimeout(timeoutId)
-  }, [postContent, isRegularReply, _parentEvent])
-
-  // Initialize selected relays based on context
-  useEffect(() => {
-    if (openFrom && openFrom.length) {
-      // If called with specific relay URLs (e.g., from a discussion thread)
-      setSelectedRelayUrls(Array.from(new Set(openFrom)))
-      return
-    }
-    
-    // Check if we're replying to a discussion or comment that requires specific relay routing
-    if (_parentEvent && (_parentEvent.kind === ExtendedKind.DISCUSSION || _parentEvent.kind === ExtendedKind.COMMENT)) {
-      let relayHint: string | undefined
-      
-      if (_parentEvent.kind === ExtendedKind.COMMENT) {
-        // For kind 1111 (COMMENT): look for 'E' tag which points to the root event
-        const ETag = _parentEvent.tags.find(tag => tag[0] === 'E')
-        if (ETag && ETag[2]) {
-          relayHint = ETag[2] // Relay hint is the 3rd element
-        }
-        
-        // If no 'E' tag, check lowercase 'e' tag for parent event
-        if (!relayHint) {
-          const eTag = _parentEvent.tags.find(tag => tag[0] === 'e')
-          if (eTag && eTag[2]) {
-            relayHint = eTag[2]
-          }
-        }
-      } else if (_parentEvent.kind === ExtendedKind.DISCUSSION) {
-        // For kind 11 (DISCUSSION): get relay hint from where it was found
-        const eventHints = client.getEventHints(_parentEvent.id)
-        if (eventHints.length > 0) {
-          relayHint = eventHints[0]
-        }
-      }
-      
-      // If we found a valid relay hint, use it instead of write relays
-      if (relayHint && isWebsocketUrl(relayHint)) {
-        const normalizedRelayHint = normalizeUrl(relayHint)
-        if (normalizedRelayHint) {
-          setSelectedRelayUrls([normalizedRelayHint])
-          return
-        }
-      }
-    }
-    
-    // Default to write relays + mention relays for regular replies, or just write relays for other cases
-    if (isRegularReply) {
-      // For regular replies, include write relays and mention relays
-      // Normalize URLs before combining to avoid duplicates with/without trailing slashes
-      const normalizedWriteRelays = relayUrls.map(url => normalizeUrl(url) || url)
-      const normalizedMentionRelays = mentionRelays.map(url => normalizeUrl(url) || url)
-      const defaultRelays = Array.from(new Set([...normalizedWriteRelays, ...normalizedMentionRelays]))
-      console.log('PostRelaySelector: Setting default relays for regular reply:', {
-        relayUrls,
-        mentionRelays,
-        defaultRelays,
-        isRegularReply
-      })
-      setSelectedRelayUrls(defaultRelays)
-    } else {
-      // For other cases, just use write relays
-      console.log('PostRelaySelector: Setting default relays for non-regular reply:', relayUrls)
-      setSelectedRelayUrls(relayUrls)
-    }
-  }, [openFrom, _parentEvent, relayUrls, isRegularReply, mentionRelays])
+    updateRelaySelection()
+  }, [openFrom, _parentEvent, relayUrls, favoriteRelays, blockedRelays, relaySets, isPublicMessage, postContent, pubkey, relayList])
 
   // Update parent component with selected relays
   useEffect(() => {
     const isProtectedEvent = selectedRelayUrls.length > 0 && !selectedRelayUrls.some(url => relayUrls.includes(url))
     setIsProtectedEvent(isProtectedEvent)
     setAdditionalRelayUrls(selectedRelayUrls)
-    // Expose user's write relays to parent component
-    setUserWriteRelays?.(relayUrls)
-  }, [selectedRelayUrls, relayUrls, setIsProtectedEvent, setAdditionalRelayUrls, setUserWriteRelays])
+  }, [selectedRelayUrls, relayUrls, setIsProtectedEvent, setAdditionalRelayUrls])
 
   const handleRelayCheckedChange = useCallback((checked: boolean, url: string) => {
     if (checked) {
       setSelectedRelayUrls(prev => [...prev, url])
     } else {
-      setSelectedRelayUrls(prev => prev.filter(selectedUrl => selectedUrl !== url))
+      setSelectedRelayUrls(prev => prev.filter(u => u !== url))
     }
   }, [])
 
-  const content = useMemo(() => {
-    if (selectableRelays.length === 0) {
-      return (
-        <div className="px-4 py-3 text-sm text-muted-foreground text-center">
-          {t('No relays available')}
-        </div>
-      )
-    }
+  const handleSelectAll = useCallback(() => {
+    setSelectedRelayUrls([...selectableRelays])
+  }, [selectableRelays])
 
-    return (
-      <div className="space-y-1 max-h-64 overflow-y-auto">
-        {selectableRelays.map((url) => (
-          <MenuItem
-            key={url}
-            checked={selectedRelayUrls.includes(url)}
-            onCheckedChange={(checked) => handleRelayCheckedChange(checked, url)}
-          >
-            <div className="flex items-center gap-2">
-              <RelayIcon url={url} />
-              <div className="truncate">{simplifyUrl(url)}</div>
-            </div>
-          </MenuItem>
-        ))}
-      </div>
-    )
-  }, [selectedRelayUrls, selectableRelays])
+  const handleClearAll = useCallback(() => {
+    setSelectedRelayUrls([])
+  }, [])
 
-  if (isSmallScreen) {
-    return (
-      <>
-        <div className="flex items-center gap-2">
-          {t('Post to')}
-          <Button
-            variant="outline"
-            className="px-2 flex-1 max-w-fit justify-start"
-            onClick={() => setIsDrawerOpen(true)}
+  const content = (
+    <div className="space-y-2">
+      {selectableRelays.length > 0 && (
+        <div className="flex gap-2">
+          <button
+            onClick={handleSelectAll}
+            className="text-xs text-muted-foreground hover:text-foreground"
+          >
+            {t('Select All')}
+          </button>
+          <button
+            onClick={handleClearAll}
+            className="text-xs text-muted-foreground hover:text-foreground"
           >
-            <div className="truncate">{description}</div>
-          </Button>
+            {t('Clear All')}
+          </button>
         </div>
-        <Drawer open={isDrawerOpen} onOpenChange={setIsDrawerOpen}>
-          <DrawerOverlay onClick={() => setIsDrawerOpen(false)} />
-          <DrawerContent className="max-h-[80vh]" hideOverlay>
-            <div
-              className="overflow-y-auto overscroll-contain py-2"
-              style={{ touchAction: 'pan-y' }}
-            >
-              {content}
-            </div>
-          </DrawerContent>
-        </Drawer>
-      </>
-    )
-  }
-
-  return (
-    <DropdownMenu>
-      <div className="flex items-center gap-2">
-        {t('Post to')}
-        <DropdownMenuTrigger asChild>
-          <Button variant="outline" className="px-2 flex-1 max-w-fit justify-start">
-            <div className="truncate">{description}</div>
-          </Button>
-        </DropdownMenuTrigger>
+      )}
+      
+      <div className="max-h-48 overflow-y-auto space-y-1">
+        {isLoading ? (
+          <div className="text-sm text-muted-foreground p-2">{t('Loading relays...')}</div>
+        ) : selectableRelays.length === 0 ? (
+          <div className="text-sm text-muted-foreground p-2">{t('No relays available')}</div>
+        ) : (
+          selectableRelays.map((url) => {
+            const isChecked = selectedRelayUrls.includes(url)
+            return (
+              <div
+                key={url}
+                className="flex items-center gap-2 p-2 hover:bg-accent rounded cursor-pointer"
+                onClick={() => handleRelayCheckedChange(!isChecked, url)}
+              >
+                <div className="flex items-center justify-center w-4 h-4 border border-border rounded">
+                  {isChecked && <Check className="w-3 h-3" />}
+                </div>
+                <RelayIcon url={url} className="w-4 h-4" />
+                <span className="text-sm flex-1 truncate">{simplifyUrl(url)}</span>
+              </div>
+            )
+          })
+        )}
       </div>
-      <DropdownMenuContent align="start" className="max-w-96 max-h-[50vh]" showScrollButtons>
-        {content}
-      </DropdownMenuContent>
-    </DropdownMenu>
+    </div>
   )
-}
-
-
-function MenuItem({
-  children,
-  checked,
-  onCheckedChange
-}: {
-  children: React.ReactNode
-  checked: boolean
-  onCheckedChange: (checked: boolean) => void
-}) {
-  const { isSmallScreen } = useScreenSize()
 
   if (isSmallScreen) {
     return (
-      <div
-        onClick={() => onCheckedChange(!checked)}
-        className="flex items-center gap-2 px-4 py-3 clickable"
-      >
-        <div className="flex items-center justify-center size-4 shrink-0">
-          {checked && <Check className="size-4" />}
+      <div className="space-y-2">
+        <div className="flex items-center justify-between">
+          <span className="text-sm font-medium">{t('Post to')}</span>
+          <span className="text-sm text-muted-foreground">{description}</span>
+        </div>
+        
+        {/* Drawer implementation would go here */}
+        <div className="border border-border rounded p-2">
+          {content}
         </div>
-        {children}
       </div>
     )
   }
 
   return (
-    <div
-      onClick={() => onCheckedChange(!checked)}
-      className="flex items-center gap-2 px-2 py-2 hover:bg-muted cursor-pointer rounded-sm"
-    >
-      <div className="flex items-center justify-center size-4 shrink-0">
-        {checked && <Check className="size-4" />}
+    <div className="space-y-2">
+      <div className="flex items-center justify-between">
+        <span className="text-sm font-medium">{t('Post to')}</span>
+        <span className="text-sm text-muted-foreground">{description}</span>
+      </div>
+      
+      <div className="border border-border rounded p-2">
+        {content}
       </div>
-      {children}
     </div>
   )
-}
+}
\ No newline at end of file
diff --git a/src/components/SaveRelayDropdownMenu/index.tsx b/src/components/SaveRelayDropdownMenu/index.tsx
index 698def4..2f8fb3b 100644
--- a/src/components/SaveRelayDropdownMenu/index.tsx
+++ b/src/components/SaveRelayDropdownMenu/index.tsx
@@ -20,7 +20,7 @@ import { useFavoriteRelays } from '@/providers/FavoriteRelaysProvider'
 import { useNostr } from '@/providers/NostrProvider'
 import { useScreenSize } from '@/providers/ScreenSizeProvider'
 import { TRelaySet } from '@/types'
-import { Check, FolderPlus, Plus, Star } from 'lucide-react'
+import { Ban, Check, FolderPlus, Loader2, Plus, Star } from 'lucide-react'
 import { useMemo, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import DrawerMenuItem from '../DrawerMenuItem'
@@ -78,6 +78,8 @@ export default function SaveRelayDropdownMenu({
                 ))}
                 <Separator />
                 <SaveToNewSet urls={normalizedUrls} />
+                <Separator />
+                <BlockRelayItem urls={normalizedUrls} />
               </div>
             </DrawerContent>
           </Drawer>
@@ -100,6 +102,8 @@ export default function SaveRelayDropdownMenu({
         ))}
         <DropdownMenuSeparator />
         <SaveToNewSet urls={normalizedUrls} />
+        <DropdownMenuSeparator />
+        <BlockRelayItem urls={normalizedUrls} />
       </DropdownMenuContent>
     </DropdownMenu>
   )
@@ -229,3 +233,50 @@ function SaveToNewSet({ urls }: { urls: string[] }) {
     </DropdownMenuItem>
   )
 }
+
+function BlockRelayItem({ urls }: { urls: string[] }) {
+  const { t } = useTranslation()
+  const { isSmallScreen } = useScreenSize()
+  const { blockedRelays, addBlockedRelays, deleteBlockedRelays } = useFavoriteRelays()
+  const [isLoading, setIsLoading] = useState(false)
+  const blocked = useMemo(
+    () => urls.every((url) => blockedRelays.includes(url)),
+    [blockedRelays, urls]
+  )
+
+  const handleClick = async () => {
+    if (isLoading) return
+    
+    setIsLoading(true)
+    try {
+      if (blocked) {
+        await deleteBlockedRelays(urls)
+      } else {
+        await addBlockedRelays(urls)
+      }
+    } catch (error) {
+      console.error('Failed to toggle blocked relay:', error)
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  if (isSmallScreen) {
+    return (
+      <DrawerMenuItem 
+        onClick={isLoading ? undefined : handleClick} 
+        className={isLoading ? 'opacity-50 cursor-not-allowed' : ''}
+      >
+        {isLoading ? <Loader2 className="animate-spin" /> : <Ban />}
+        {isLoading ? t('Processing...') : blocked ? t('Unblock') : t('Block')}
+      </DrawerMenuItem>
+    )
+  }
+
+  return (
+    <DropdownMenuItem onClick={handleClick} disabled={isLoading}>
+      {isLoading ? <Loader2 className="animate-spin" /> : <Ban />}
+      {isLoading ? t('Processing...') : blocked ? t('Unblock') : t('Block')}
+    </DropdownMenuItem>
+  )
+}
diff --git a/src/constants.ts b/src/constants.ts
index 7737257..3d30903 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -124,6 +124,7 @@ export const ExtendedKind = {
   PUBLIC_MESSAGE: 24,
   DISCUSSION: 11,
   FAVORITE_RELAYS: 10012,
+  BLOCKED_RELAYS: 10006,
   BLOSSOM_SERVER_LIST: 10063,
   RELAY_REVIEW: 31987,
   GROUP_METADATA: 39000,
diff --git a/src/lib/draft-event.ts b/src/lib/draft-event.ts
index 69d700e..339c922 100644
--- a/src/lib/draft-event.ts
+++ b/src/lib/draft-event.ts
@@ -438,6 +438,19 @@ export function createFavoriteRelaysDraftEvent(
   }
 }
 
+export function createBlockedRelaysDraftEvent(blockedRelays: string[]): TDraftEvent {
+  const tags: string[][] = []
+  blockedRelays.forEach((url) => {
+    tags.push(buildRelayTag(url))
+  })
+  return {
+    kind: ExtendedKind.BLOCKED_RELAYS,
+    content: '',
+    tags,
+    created_at: dayjs().unix()
+  }
+}
+
 export function createSeenNotificationsAtDraftEvent(): TDraftEvent {
   return {
     kind: kinds.Application,
diff --git a/src/lib/nip05.ts b/src/lib/nip05.ts
index b9ce232..0c80525 100644
--- a/src/lib/nip05.ts
+++ b/src/lib/nip05.ts
@@ -5,6 +5,7 @@ type TVerifyNip05Result = {
   isVerified: boolean
   nip05Name: string
   nip05Domain: string
+  relays?: string[]
 }
 
 const verifyNip05ResultCache = new LRUCache<string, TVerifyNip05Result>({
@@ -17,14 +18,16 @@ const verifyNip05ResultCache = new LRUCache<string, TVerifyNip05Result>({
 
 async function _verifyNip05(nip05: string, pubkey: string): Promise<TVerifyNip05Result> {
   const [nip05Name, nip05Domain] = nip05?.split('@') || [undefined, undefined]
-  const result = { isVerified: false, nip05Name, nip05Domain }
+  const result: TVerifyNip05Result = { isVerified: false, nip05Name, nip05Domain }
   if (!nip05Name || !nip05Domain || !pubkey) return result
 
   try {
     const res = await fetch(getWellKnownNip05Url(nip05Domain, nip05Name))
     const json = await res.json()
     if (json.names?.[nip05Name] === pubkey) {
-      return { ...result, isVerified: true }
+      // Also extract relays if available (NIP-05 spec allows a relays object)
+      const relays = json.relays?.[pubkey]
+      return { ...result, isVerified: true, relays: Array.isArray(relays) ? relays : undefined }
     }
   } catch {
     // ignore
@@ -69,3 +72,20 @@ export async function fetchPubkeysFromDomain(domain: string): Promise<string[]>
     return []
   }
 }
+
+/**
+ * Attempt to get relays from NIP-07 extension
+ * Some extensions support a getRelays() method
+ */
+export async function getRelaysFromNip07Extension(): Promise<string[]> {
+  try {
+    if (window.nostr && typeof window.nostr.getRelays === 'function') {
+      const relaysObj = await window.nostr.getRelays()
+      // getRelays() returns an object like { "wss://relay.url": {read: true, write: true} }
+      return Object.keys(relaysObj || {})
+    }
+  } catch (error) {
+    console.log('NIP-07 extension does not support getRelays():', error)
+  }
+  return []
+}
diff --git a/src/pages/primary/DiscussionsPage/CreateThreadDialog.tsx b/src/pages/primary/DiscussionsPage/CreateThreadDialog.tsx
index 329319d..e435c42 100644
--- a/src/pages/primary/DiscussionsPage/CreateThreadDialog.tsx
+++ b/src/pages/primary/DiscussionsPage/CreateThreadDialog.tsx
@@ -10,14 +10,16 @@ import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
 import { Checkbox } from '@/components/ui/checkbox'
 import { ScrollArea } from '@/components/ui/scroll-area'
 import { Hash, X, Users, Code, Coins, Newspaper, BookOpen, Scroll, Cpu, Trophy, Film, Heart, TrendingUp, Utensils, MapPin, Home, PawPrint, Shirt, Image, Zap, Settings, Book, Network, Car, Eye, Edit3 } from 'lucide-react'
-import { useState, useEffect, useMemo } from 'react'
+import { useState, useEffect } from 'react'
 import { useTranslation } from 'react-i18next'
 import { useNostr } from '@/providers/NostrProvider'
+import { useFavoriteRelays } from '@/providers/FavoriteRelaysProvider'
 import { TDraftEvent, TRelaySet } from '@/types'
 import { NostrEvent } from 'nostr-tools'
 import { prefixNostrAddresses } from '@/lib/nostr-address'
 import { showPublishingError } from '@/lib/publishing-feedback'
-import { normalizeUrl, simplifyUrl } from '@/lib/url'
+import { simplifyUrl } from '@/lib/url'
+import relaySelectionService from '@/services/relay-selection.service'
 import dayjs from 'dayjs'
 import { extractHashtagsFromContent, normalizeTopic } from '@/lib/discussion-topics'
 import DiscussionContent from '@/components/Note/DiscussionContent'
@@ -82,17 +84,20 @@ export default function CreateThreadDialog({
   onThreadCreated 
 }: CreateThreadDialogProps) {
   const { t } = useTranslation()
-  const { pubkey, publish } = useNostr()
+  const { pubkey, publish, relayList } = useNostr()
+  const { favoriteRelays, blockedRelays } = useFavoriteRelays()
   const [title, setTitle] = useState('')
   const [content, setContent] = useState('')
   const [selectedTopic] = useState(initialTopic)
   const [selectedRelayUrls, setSelectedRelayUrls] = useState<string[]>([])
+  const [selectableRelays, setSelectableRelays] = useState<string[]>([])
   const [isSubmitting, setIsSubmitting] = useState(false)
   const [errors, setErrors] = useState<{ title?: string; content?: string; relay?: string; author?: string; subject?: string }>({})
   const [isNsfw, setIsNsfw] = useState(false)
   const [addClientTag, setAddClientTag] = useState(true)
   const [minPow, setMinPow] = useState(0)
   const [showAdvancedOptions, setShowAdvancedOptions] = useState(false)
+  const [isLoadingRelays, setIsLoadingRelays] = useState(true)
   
   // Readings options state
   const [isReadingGroup, setIsReadingGroup] = useState(false)
@@ -100,36 +105,62 @@ export default function CreateThreadDialog({
   const [subject, setSubject] = useState('')
   const [showReadingsPanel, setShowReadingsPanel] = useState(false)
 
-  // Get all selectable relays (includes relays from selected relay set if applicable)
-  const selectableRelays = useMemo(() => {
-    const relaySet = initialRelay ? relaySets.find(set => set.id === initialRelay) : null
-    if (relaySet) {
-      // Include relays from the selected set along with available relays
-      return Array.from(new Set([
-        ...availableRelays.map(url => normalizeUrl(url) || url),
-        ...relaySet.relayUrls.map(url => normalizeUrl(url) || url)
-      ]))
+  // Initialize selected relays using the centralized relay selection service
+  useEffect(() => {
+    const initializeRelays = async () => {
+      setIsLoadingRelays(true)
+      try {
+        // Determine openFrom based on initialRelay
+        let openFrom: string[] | undefined = undefined
+        if (initialRelay) {
+          const relaySet = relaySets.find(set => set.id === initialRelay)
+          if (relaySet) {
+            openFrom = relaySet.relayUrls
+          } else {
+            openFrom = [initialRelay]
+          }
+        }
+
+        const result = await relaySelectionService.selectRelays({
+          userWriteRelays: relayList?.write || [],
+          userReadRelays: relayList?.read || [],
+          favoriteRelays,
+          blockedRelays,
+          relaySets,
+          openFrom,
+          userPubkey: pubkey || undefined
+        })
+
+        setSelectableRelays(result.selectableRelays)
+        setSelectedRelayUrls(result.selectedRelays)
+      } catch (error) {
+        console.error('Failed to initialize relays:', error)
+        // Fallback to availableRelays
+        setSelectableRelays(availableRelays)
+        setSelectedRelayUrls(availableRelays)
+      } finally {
+        setIsLoadingRelays(false)
+      }
     }
-    return availableRelays
-  }, [availableRelays, relaySets, initialRelay])
 
-  // Initialize selected relays based on the originating view state
-  useEffect(() => {
-    if (initialRelay === null || initialRelay === undefined) {
-      // "All relays" selected - check all available relays
-      setSelectedRelayUrls(availableRelays)
+    initializeRelays()
+  }, [initialRelay, availableRelays, relaySets, favoriteRelays, blockedRelays, relayList, pubkey])
+
+  const handleRelayCheckedChange = (checked: boolean, url: string) => {
+    if (checked) {
+      setSelectedRelayUrls(prev => [...prev, url])
     } else {
-      // Check if it's a relay set ID
-      const relaySet = relaySets.find(set => set.id === initialRelay)
-      if (relaySet) {
-        // It's a relay set - check all relays in that set
-        setSelectedRelayUrls(relaySet.relayUrls)
-      } else {
-        // It's a specific relay - check just that relay
-        setSelectedRelayUrls([initialRelay])
-      }
+      setSelectedRelayUrls(prev => prev.filter(u => u !== url))
     }
-  }, [initialRelay, availableRelays, relaySets])
+  }
+
+  const handleSelectAll = () => {
+    setSelectedRelayUrls([...selectableRelays])
+  }
+
+  const handleClearAll = () => {
+    setSelectedRelayUrls([])
+  }
 
   const validateForm = () => {
     const newErrors: { title?: string; content?: string; relay?: string; author?: string; subject?: string } = {}
@@ -512,7 +543,11 @@ export default function CreateThreadDialog({
             <div className="space-y-2">
               <Label>{t('Publish to Relays')}</Label>
               <ScrollArea className={`max-h-64 rounded-md border p-4 ${errors.relay ? 'border-destructive' : ''}`}>
-                {selectableRelays.length === 0 ? (
+                {isLoadingRelays ? (
+                  <div className="text-sm text-muted-foreground text-center py-4">
+                    {t('Loading relays...')}
+                  </div>
+                ) : selectableRelays.length === 0 ? (
                   <div className="text-sm text-muted-foreground text-center py-4">
                     {t('No relays available. Please configure relays in settings.')}
                   </div>
@@ -525,13 +560,8 @@ export default function CreateThreadDialog({
                           <Checkbox
                             id={`relay-${relay}`}
                             checked={isChecked}
-                            onCheckedChange={(checked) => {
-                              if (checked) {
-                                setSelectedRelayUrls(prev => [...prev, relay])
-                              } else {
-                                setSelectedRelayUrls(prev => prev.filter(url => url !== relay))
-                              }
-                            }}
+                            onCheckedChange={(checked) => handleRelayCheckedChange(!!checked, relay)}
+                            disabled={isLoadingRelays}
                           />
                           <label
                             htmlFor={`relay-${relay}`}
@@ -560,7 +590,8 @@ export default function CreateThreadDialog({
                     type="button"
                     variant="ghost"
                     size="sm"
-                    onClick={() => setSelectedRelayUrls(selectableRelays)}
+                    onClick={handleSelectAll}
+                    disabled={isLoadingRelays}
                   >
                     {t('Select All')}
                   </Button>
@@ -568,7 +599,8 @@ export default function CreateThreadDialog({
                     type="button"
                     variant="ghost"
                     size="sm"
-                    onClick={() => setSelectedRelayUrls([])}
+                    onClick={handleClearAll}
+                    disabled={isLoadingRelays}
                   >
                     {t('Clear All')}
                   </Button>
diff --git a/src/providers/FavoriteRelaysProvider.tsx b/src/providers/FavoriteRelaysProvider.tsx
index 13cc992..60d908b 100644
--- a/src/providers/FavoriteRelaysProvider.tsx
+++ b/src/providers/FavoriteRelaysProvider.tsx
@@ -1,5 +1,5 @@
 import { BIG_RELAY_URLS, DEFAULT_FAVORITE_RELAYS } from '@/constants'
-import { createFavoriteRelaysDraftEvent, createRelaySetDraftEvent } from '@/lib/draft-event'
+import { createFavoriteRelaysDraftEvent, createBlockedRelaysDraftEvent, createRelaySetDraftEvent } from '@/lib/draft-event'
 import { getReplaceableEventIdentifier } from '@/lib/event'
 import { getRelaySetFromEvent } from '@/lib/event-metadata'
 import { randomString } from '@/lib/random'
@@ -17,6 +17,9 @@ type TFavoriteRelaysContext = {
   addFavoriteRelays: (relayUrls: string[]) => Promise<void>
   deleteFavoriteRelays: (relayUrls: string[]) => Promise<void>
   reorderFavoriteRelays: (reorderedRelays: string[]) => Promise<void>
+  blockedRelays: string[]
+  addBlockedRelays: (relayUrls: string[]) => Promise<void>
+  deleteBlockedRelays: (relayUrls: string[]) => Promise<void>
   relaySets: TRelaySet[]
   createRelaySet: (relaySetName: string, relayUrls?: string[]) => Promise<void>
   addRelaySets: (newRelaySetEvents: Event[]) => Promise<void>
@@ -36,8 +39,9 @@ export const useFavoriteRelays = () => {
 }
 
 export function FavoriteRelaysProvider({ children }: { children: React.ReactNode }) {
-  const { favoriteRelaysEvent, updateFavoriteRelaysEvent, pubkey, relayList, publish } = useNostr()
+  const { favoriteRelaysEvent, blockedRelaysEvent, updateFavoriteRelaysEvent, updateBlockedRelaysEvent, pubkey, relayList, publish } = useNostr()
   const [favoriteRelays, setFavoriteRelays] = useState<string[]>([])
+  const [blockedRelays, setBlockedRelays] = useState<string[]>([])
   const [relaySetEvents, setRelaySetEvents] = useState<Event[]>([])
   const [relaySets, setRelaySets] = useState<TRelaySet[]>([])
 
@@ -140,6 +144,24 @@ export function FavoriteRelaysProvider({ children }: { children: React.ReactNode
     init()
   }, [favoriteRelaysEvent])
 
+  useEffect(() => {
+    if (!blockedRelaysEvent) {
+      setBlockedRelays([])
+      return
+    }
+
+    const relays: string[] = []
+    blockedRelaysEvent.tags.forEach(([tagName, tagValue]) => {
+      if (tagName === 'relay' && tagValue) {
+        const normalizedUrl = normalizeUrl(tagValue)
+        if (normalizedUrl && !relays.includes(normalizedUrl)) {
+          relays.push(normalizedUrl)
+        }
+      }
+    })
+    setBlockedRelays(relays)
+  }, [blockedRelaysEvent])
+
   useEffect(() => {
     setRelaySets(
       relaySetEvents.map((evt) => getRelaySetFromEvent(evt)).filter(Boolean) as TRelaySet[]
@@ -237,6 +259,27 @@ export function FavoriteRelaysProvider({ children }: { children: React.ReactNode
     updateFavoriteRelaysEvent(newFavoriteRelaysEvent)
   }
 
+  const addBlockedRelays = async (relayUrls: string[]) => {
+    const normalizedUrls = relayUrls
+      .map((relayUrl) => normalizeUrl(relayUrl))
+      .filter((url) => !!url && !blockedRelays.includes(url))
+    if (!normalizedUrls.length) return
+    const newBlockedRelays = [...blockedRelays, ...normalizedUrls]
+    setBlockedRelays(newBlockedRelays)
+    const draftEvent = createBlockedRelaysDraftEvent(newBlockedRelays)
+    const newBlockedRelaysEvent = await publish(draftEvent)
+    updateBlockedRelaysEvent(newBlockedRelaysEvent)
+  }
+
+  const deleteBlockedRelays = async (relayUrls: string[]) => {
+    const normalizedUrls = relayUrls.map((relayUrl) => normalizeUrl(relayUrl)).filter(Boolean)
+    const newBlockedRelays = blockedRelays.filter((relay) => !normalizedUrls.includes(relay))
+    setBlockedRelays(newBlockedRelays)
+    const draftEvent = createBlockedRelaysDraftEvent(newBlockedRelays)
+    const newBlockedRelaysEvent = await publish(draftEvent)
+    updateBlockedRelaysEvent(newBlockedRelaysEvent)
+  }
+
   const reorderRelaySets = async (reorderedSets: TRelaySet[]) => {
     setRelaySets(reorderedSets)
     const draftEvent = createFavoriteRelaysDraftEvent(
@@ -254,6 +297,9 @@ export function FavoriteRelaysProvider({ children }: { children: React.ReactNode
         addFavoriteRelays,
         deleteFavoriteRelays,
         reorderFavoriteRelays,
+        blockedRelays,
+        addBlockedRelays,
+        deleteBlockedRelays,
         relaySets,
         createRelaySet,
         addRelaySets,
diff --git a/src/providers/NostrProvider/index.tsx b/src/providers/NostrProvider/index.tsx
index 278b2ab..06d6366 100644
--- a/src/providers/NostrProvider/index.tsx
+++ b/src/providers/NostrProvider/index.tsx
@@ -56,6 +56,7 @@ type TNostrContext = {
   bookmarkListEvent: Event | null
   interestListEvent: Event | null
   favoriteRelaysEvent: Event | null
+  blockedRelaysEvent: Event | null
   userEmojiListEvent: Event | null
   notificationsSeenAt: number
   account: TAccountPointer | null
@@ -88,6 +89,7 @@ type TNostrContext = {
   updateBookmarkListEvent: (bookmarkListEvent: Event) => Promise<void>
   updateInterestListEvent: (interestListEvent: Event) => Promise<void>
   updateFavoriteRelaysEvent: (favoriteRelaysEvent: Event) => Promise<void>
+  updateBlockedRelaysEvent: (blockedRelaysEvent: Event) => Promise<void>
   updateNotificationsSeenAt: (skipPublish?: boolean) => Promise<void>
 }
 
@@ -159,6 +161,7 @@ export function NostrProvider({ children }: { children: React.ReactNode }) {
   const [bookmarkListEvent, setBookmarkListEvent] = useState<Event | null>(null)
   const [interestListEvent, setInterestListEvent] = useState<Event | null>(null)
   const [favoriteRelaysEvent, setFavoriteRelaysEvent] = useState<Event | null>(null)
+  const [blockedRelaysEvent, setBlockedRelaysEvent] = useState<Event | null>(null)
   const [userEmojiListEvent, setUserEmojiListEvent] = useState<Event | null>(null)
   const [notificationsSeenAt, setNotificationsSeenAt] = useState(-1)
   const [isInitialized, setIsInitialized] = useState(false)
@@ -307,6 +310,7 @@ export function NostrProvider({ children }: { children: React.ReactNode }) {
       const bookmarkListEvent = sortedEvents.find((e) => e.kind === kinds.BookmarkList)
       const interestListEvent = sortedEvents.find((e) => e.kind === 10015)
       const favoriteRelaysEvent = sortedEvents.find((e) => e.kind === ExtendedKind.FAVORITE_RELAYS)
+      const blockedRelaysEvent = sortedEvents.find((e) => e.kind === ExtendedKind.BLOCKED_RELAYS)
       const blossomServerListEvent = sortedEvents.find(
         (e) => e.kind === ExtendedKind.BLOSSOM_SERVER_LIST
       )
@@ -359,6 +363,12 @@ export function NostrProvider({ children }: { children: React.ReactNode }) {
           setFavoriteRelaysEvent(updatedFavoriteRelaysEvent)
         }
       }
+      if (blockedRelaysEvent) {
+        const updatedBlockedRelaysEvent = await indexedDb.putReplaceableEvent(blockedRelaysEvent)
+        if (updatedBlockedRelaysEvent.id === blockedRelaysEvent.id) {
+          setBlockedRelaysEvent(updatedBlockedRelaysEvent)
+        }
+      }
       if (blossomServerListEvent) {
         await client.updateBlossomServerListEventCache(blossomServerListEvent)
       }
@@ -847,6 +857,13 @@ export function NostrProvider({ children }: { children: React.ReactNode }) {
     setFavoriteRelaysEvent(newFavoriteRelaysEvent)
   }
 
+  const updateBlockedRelaysEvent = async (blockedRelaysEvent: Event) => {
+    const newBlockedRelaysEvent = await indexedDb.putReplaceableEvent(blockedRelaysEvent)
+    if (newBlockedRelaysEvent.id !== blockedRelaysEvent.id) return
+
+    setBlockedRelaysEvent(newBlockedRelaysEvent)
+  }
+
   const updateNotificationsSeenAt = async (skipPublish = false) => {
     if (!account) return
 
@@ -882,6 +899,7 @@ export function NostrProvider({ children }: { children: React.ReactNode }) {
         bookmarkListEvent,
         interestListEvent,
         favoriteRelaysEvent,
+        blockedRelaysEvent,
         userEmojiListEvent,
         notificationsSeenAt,
         account,
@@ -911,6 +929,7 @@ export function NostrProvider({ children }: { children: React.ReactNode }) {
         updateBookmarkListEvent,
         updateInterestListEvent,
         updateFavoriteRelaysEvent,
+        updateBlockedRelaysEvent,
         updateNotificationsSeenAt
       }}
     >
diff --git a/src/services/relay-selection.service.ts b/src/services/relay-selection.service.ts
new file mode 100644
index 0000000..27e4c81
--- /dev/null
+++ b/src/services/relay-selection.service.ts
@@ -0,0 +1,412 @@
+import { Event, kinds } from 'nostr-tools'
+import { ExtendedKind } from '@/constants'
+import { FAST_WRITE_RELAY_URLS } from '@/constants'
+import client from '@/services/client.service'
+import { normalizeUrl } from '@/lib/url'
+import { TRelaySet } from '@/types'
+
+export interface RelaySelectionContext {
+  // User's own relays
+  userWriteRelays: string[]
+  userReadRelays: string[]
+  favoriteRelays: string[]
+  blockedRelays: string[]
+  relaySets: TRelaySet[]
+  
+  // Post context
+  parentEvent?: Event
+  isPublicMessage?: boolean
+  content?: string
+  userPubkey?: string
+  openFrom?: string[]
+}
+
+export interface RelaySelectionResult {
+  selectableRelays: string[]
+  selectedRelays: string[]
+  description: string
+}
+
+class RelaySelectionService {
+  /**
+   * Main entry point for relay selection logic
+   */
+  async selectRelays(context: RelaySelectionContext): Promise<RelaySelectionResult> {
+    // Step 1: Build the list of selectable relays
+    const selectableRelays = await this.buildSelectableRelays(context)
+    
+    // Step 2: Determine which relays should be selected (checked)
+    const selectedRelays = await this.determineSelectedRelays(context, selectableRelays)
+    
+    // Step 3: Generate description
+    const description = this.generateDescription(selectedRelays)
+
+    return {
+      selectableRelays,
+      selectedRelays,
+      description
+    }
+  }
+
+  /**
+   * Build the list of all relays that can be selected
+   * Always includes: user's write relays (or fast write fallback) + favorite relays + relay sets
+   * Plus contextual relays for replies and public messages
+   */
+  private async buildSelectableRelays(context: RelaySelectionContext): Promise<string[]> {
+    const {
+      userWriteRelays,
+      favoriteRelays,
+      relaySets,
+      parentEvent,
+      isPublicMessage,
+      openFrom
+    } = context
+
+    const selectableRelays = new Set<string>()
+
+    // Always include user's write relays (or fallback to fast write relays)
+    const userRelays = userWriteRelays.length > 0 ? userWriteRelays : FAST_WRITE_RELAY_URLS
+    userRelays.forEach(url => selectableRelays.add(normalizeUrl(url) || url))
+
+    // Always include favorite relays
+    favoriteRelays.forEach(url => selectableRelays.add(normalizeUrl(url) || url))
+
+    // Always include relays from relay sets
+    relaySets.forEach(set => {
+      set.relayUrls.forEach(url => selectableRelays.add(normalizeUrl(url) || url))
+    })
+
+    // Add contextual relays for replies and public messages
+    if (parentEvent || isPublicMessage) {
+      const contextualRelays = await this.getContextualRelays(context)
+      contextualRelays.forEach(url => selectableRelays.add(normalizeUrl(url) || url))
+    }
+
+    // If called with specific relay URLs (e.g., from openFrom), include those
+    if (openFrom && openFrom.length > 0) {
+      openFrom.forEach(url => selectableRelays.add(normalizeUrl(url) || url))
+    }
+
+    // Filter out blocked relays
+    return this.filterBlockedRelays(Array.from(selectableRelays).filter(Boolean), context.blockedRelays)
+  }
+
+  /**
+   * Get contextual relays based on the type of post
+   */
+  private async getContextualRelays(context: RelaySelectionContext): Promise<string[]> {
+    const { parentEvent, isPublicMessage, content, userPubkey } = context
+    const contextualRelays = new Set<string>()
+
+    try {
+      // For replies (any kind) and public messages
+      if (parentEvent || isPublicMessage) {
+        // Get the replied-to author's read relays
+        if (parentEvent) {
+          const authorRelayList = await client.fetchRelayList(parentEvent.pubkey)
+          if (authorRelayList?.read) {
+            authorRelayList.read.slice(0, 4).forEach(url => contextualRelays.add(url))
+          }
+        }
+
+        // Get relay hint from where the event was discovered
+        if (parentEvent) {
+          const eventHints = client.getEventHints(parentEvent.id)
+          eventHints.forEach(url => contextualRelays.add(url))
+        }
+
+        // For public messages, also get mentioned users' read relays
+        if (isPublicMessage && content && userPubkey) {
+          const mentions = await this.extractMentions(content, parentEvent)
+          const mentionedPubkeys = mentions.filter(p => p !== userPubkey)
+          
+          if (mentionedPubkeys.length > 0) {
+            const mentionRelayLists = await Promise.all(
+              mentionedPubkeys.map(async (pubkey) => {
+                try {
+                  const relayList = await client.fetchRelayList(pubkey)
+                  return relayList?.read || []
+                } catch (error) {
+                  console.warn(`Failed to fetch relay list for ${pubkey}:`, error)
+                  return []
+                }
+              })
+            )
+            mentionRelayLists.flat().forEach(url => contextualRelays.add(url))
+          }
+        }
+      }
+    } catch (error) {
+      console.error('Failed to get contextual relays:', error)
+    }
+
+    return Array.from(contextualRelays)
+  }
+
+  /**
+   * Determine which relays should be selected (checked) based on the context
+   */
+  private async determineSelectedRelays(
+    context: RelaySelectionContext,
+    _selectableRelays: string[]
+  ): Promise<string[]> {
+    const {
+      userWriteRelays,
+      parentEvent,
+      isPublicMessage,
+      openFrom
+    } = context
+
+    let selectedRelays: string[] = []
+
+    // If called with specific relay URLs, use those
+    if (openFrom && openFrom.length > 0) {
+      selectedRelays = openFrom.map(url => normalizeUrl(url) || url).filter(Boolean)
+    }
+    // For discussion replies, use relay hint from the kind 11 at the top of the thread
+    else if (parentEvent && (parentEvent.kind === ExtendedKind.DISCUSSION || parentEvent.kind === ExtendedKind.COMMENT)) {
+      const discussionRelay = this.getDiscussionRelayHint(parentEvent)
+      if (discussionRelay) {
+        selectedRelays = [discussionRelay]
+      }
+    }
+    // For public messages, use sender outboxes + receiver inboxes
+    else if (isPublicMessage || (parentEvent && parentEvent.kind === ExtendedKind.PUBLIC_MESSAGE)) {
+      selectedRelays = await this.getPublicMessageRelays(context)
+    }
+    // For regular replies, use user's write relays + mention relays
+    else if (parentEvent && this.isRegularReply(parentEvent)) {
+      selectedRelays = await this.getRegularReplyRelays(context)
+    }
+    // Default: user's write relays (or fallback to fast write relays if no user relays)
+    else {
+      const defaultRelays = userWriteRelays.length > 0 ? userWriteRelays : FAST_WRITE_RELAY_URLS
+      selectedRelays = defaultRelays.map(url => normalizeUrl(url) || url).filter(Boolean)
+    }
+
+    // Filter out blocked relays
+    return this.filterBlockedRelays(selectedRelays, context.blockedRelays)
+  }
+
+  /**
+   * Get relays for public messages: sender outboxes + receiver inboxes
+   */
+  private async getPublicMessageRelays(context: RelaySelectionContext): Promise<string[]> {
+    const { userWriteRelays, parentEvent, isPublicMessage, content, userPubkey } = context
+    const relays = new Set<string>()
+
+    try {
+      // Add sender's write relays (outboxes) - fallback to fast write relays if no user relays
+      const senderRelays = userWriteRelays.length > 0 ? userWriteRelays : FAST_WRITE_RELAY_URLS
+      senderRelays.forEach(url => relays.add(normalizeUrl(url) || url))
+
+      // Add receiver's read relays (inboxes)
+      if (isPublicMessage && content && userPubkey) {
+        // For new public messages, get mentioned users' read relays
+        const mentions = await this.extractMentions(content, parentEvent)
+        const mentionedPubkeys = mentions.filter(p => p !== userPubkey)
+        
+        if (mentionedPubkeys.length > 0) {
+          const receiverRelayLists = await Promise.all(
+            mentionedPubkeys.map(async (pubkey) => {
+              try {
+                const relayList = await client.fetchRelayList(pubkey)
+                return relayList?.read || []
+              } catch (error) {
+                console.warn(`Failed to fetch relay list for ${pubkey}:`, error)
+                return []
+              }
+            })
+          )
+          receiverRelayLists.flat().forEach(url => relays.add(normalizeUrl(url) || url))
+        }
+      } else if (parentEvent && parentEvent.kind === ExtendedKind.PUBLIC_MESSAGE) {
+        // For public message replies, get original sender's read relays
+        try {
+          const senderRelayList = await client.fetchRelayList(parentEvent.pubkey)
+          if (senderRelayList?.read) {
+            senderRelayList.read.forEach(url => relays.add(normalizeUrl(url) || url))
+          }
+        } catch (error) {
+          console.warn(`Failed to fetch relay list for ${parentEvent.pubkey}:`, error)
+        }
+      }
+    } catch (error) {
+      console.error('Failed to get public message relays:', error)
+    }
+
+    return Array.from(relays)
+  }
+
+  /**
+   * Get relays for regular replies: user's write relays + mention relays
+   */
+  private async getRegularReplyRelays(context: RelaySelectionContext): Promise<string[]> {
+    const { userWriteRelays, parentEvent, content, userPubkey } = context
+    const relays = new Set<string>()
+
+    try {
+      // Add user's write relays - fallback to fast write relays if no user relays
+      const userRelays = userWriteRelays.length > 0 ? userWriteRelays : FAST_WRITE_RELAY_URLS
+      userRelays.forEach(url => relays.add(normalizeUrl(url) || url))
+
+      // Add mentioned users' write relays
+      if (content && userPubkey) {
+        const mentions = await this.extractMentions(content, parentEvent)
+        const mentionedPubkeys = mentions.filter(p => p !== userPubkey)
+        
+        if (mentionedPubkeys.length > 0) {
+          const mentionRelayLists = await Promise.all(
+            mentionedPubkeys.map(async (pubkey) => {
+              try {
+                const relayList = await client.fetchRelayList(pubkey)
+                return relayList?.write || []
+              } catch (error) {
+                console.warn(`Failed to fetch relay list for ${pubkey}:`, error)
+                return []
+              }
+            })
+          )
+          mentionRelayLists.flat().forEach(url => relays.add(normalizeUrl(url) || url))
+        }
+      }
+    } catch (error) {
+      console.error('Failed to get regular reply relays:', error)
+    }
+
+    return Array.from(relays)
+  }
+
+  /**
+   * Check if this is a regular reply (Kind 1 or Kind 1111, not to Kind 11)
+   */
+  private isRegularReply(parentEvent: Event): boolean {
+    return (parentEvent.kind === kinds.ShortTextNote || parentEvent.kind === ExtendedKind.COMMENT) &&
+           parentEvent.kind !== ExtendedKind.DISCUSSION
+  }
+
+  /**
+   * Get relay hint from discussion events
+   */
+  private getDiscussionRelayHint(parentEvent: Event): string | null {
+    // For kind 1111 (COMMENT): look for 'E' tag which points to the root event
+    if (parentEvent.kind === ExtendedKind.COMMENT) {
+      const ETag = parentEvent.tags.find(tag => tag[0] === 'E')
+      if (ETag && ETag[2]) {
+        return normalizeUrl(ETag[2]) || ETag[2]
+      }
+      
+      // If no 'E' tag, check lowercase 'e' tag for parent event
+      const eTag = parentEvent.tags.find(tag => tag[0] === 'e')
+      if (eTag && eTag[2]) {
+        return normalizeUrl(eTag[2]) || eTag[2]
+      }
+    } else if (parentEvent.kind === ExtendedKind.DISCUSSION) {
+      // For kind 11 (DISCUSSION): get relay hint from where it was found
+      const eventHints = client.getEventHints(parentEvent.id)
+      if (eventHints.length > 0) {
+        return normalizeUrl(eventHints[0]) || eventHints[0]
+      }
+    }
+
+    return null
+  }
+
+  /**
+   * Extract mentions from content (simplified version of the existing extractMentions)
+   */
+  private async extractMentions(content: string, parentEvent?: Event): Promise<string[]> {
+    const pubkeys: string[] = []
+    
+    // Always include parent event author if there's a parent event
+    if (parentEvent) {
+      pubkeys.push(parentEvent.pubkey)
+    }
+    
+    // Extract nostr addresses from content
+    const matches = content.match(
+      /nostr:(npub1[a-z0-9]{58}|nprofile1[a-z0-9]+|note1[a-z0-9]{58}|nevent1[a-z0-9]+)/g
+    )
+
+    if (matches) {
+      for (const match of matches) {
+        try {
+          const { nip19 } = await import('nostr-tools')
+          const id = match.split(':')[1]
+          const { type, data } = nip19.decode(id)
+          if (type === 'nprofile') {
+            if (!pubkeys.includes(data.pubkey)) {
+              pubkeys.push(data.pubkey)
+            }
+          } else if (type === 'npub') {
+            if (!pubkeys.includes(data)) {
+              pubkeys.push(data)
+            }
+          } else if (['nevent', 'note'].includes(type)) {
+            const event = await client.fetchEvent(id)
+            if (event && !pubkeys.includes(event.pubkey)) {
+              pubkeys.push(event.pubkey)
+            }
+          }
+        } catch (error) {
+          console.error('Failed to decode nostr address:', error)
+        }
+      }
+    }
+
+    // Add related pubkeys from parent event tags
+    if (parentEvent) {
+      parentEvent.tags.forEach(([tagName, tagValue]) => {
+        if (['p', 'P'].includes(tagName) && tagValue && !pubkeys.includes(tagValue)) {
+          pubkeys.push(tagValue)
+        }
+      })
+    }
+
+    return pubkeys
+  }
+
+  /**
+   * Generate description for the selected relays
+   */
+  private generateDescription(selectedRelays: string[]): string {
+    if (selectedRelays.length === 0) {
+      return 'No relays selected'
+    }
+    if (selectedRelays.length === 1) {
+      return this.simplifyUrl(selectedRelays[0])
+    }
+    return `${selectedRelays.length} relays`
+  }
+
+  /**
+   * Simplify URL for display
+   */
+  private simplifyUrl(url: string): string {
+    try {
+      const urlObj = new URL(url)
+      return urlObj.hostname
+    } catch {
+      return url
+    }
+  }
+
+  /**
+   * Filter out blocked relays from a list
+   */
+  private filterBlockedRelays(relays: string[], blockedRelays: string[]): string[] {
+    if (!blockedRelays || blockedRelays.length === 0) {
+      return relays
+    }
+
+    const normalizedBlocked = blockedRelays.map(url => normalizeUrl(url) || url)
+    return relays.filter(relay => {
+      const normalizedRelay = normalizeUrl(relay) || relay
+      return !normalizedBlocked.includes(normalizedRelay)
+    })
+  }
+}
+
+const relaySelectionService = new RelaySelectionService()
+export default relaySelectionService
diff --git a/src/types/index.d.ts b/src/types/index.d.ts
index 2821a61..e1e48f8 100644
--- a/src/types/index.d.ts
+++ b/src/types/index.d.ts
@@ -83,6 +83,7 @@ export type TNip07 = {
     encrypt?: (pubkey: string, plainText: string) => Promise<string>
     decrypt?: (pubkey: string, cipherText: string) => Promise<string>
   }
+  getRelays?: () => Promise<{ [url: string]: { read: boolean; write: boolean } }>
 }
 
 export interface ISigner {