diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdbed869..e3bbcad5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 * Fix memory leak, notification badge not showing
 * Improve space join flow
 * Fix opening images in fullscreen dialog
+* Add support for blocked relays
 
 # 1.6.2
 
diff --git a/src/app/core/commands.ts b/src/app/core/commands.ts
index 13df184f..7994031a 100644
--- a/src/app/core/commands.ts
+++ b/src/app/core/commands.ts
@@ -52,10 +52,8 @@ import {
   removeFromListByPredicate,
   getTag,
   getListTags,
-  getRelayTags,
   getRelayTagValues,
   toNostrURI,
-  getRelaysFromList,
   RelayMode,
   getAddress,
   getTagValue,
@@ -80,8 +78,6 @@ import {
   publishThunk,
   tagEvent,
   tagEventForReaction,
-  userRelayList,
-  userMessagingRelayList,
   nip44EncryptToSelf,
   dropSession,
   tagEventForComment,
@@ -208,42 +204,6 @@ export const removeRoomMembership = async (url: string, h: string) => {
   return publishThunk({event, relays})
 }
 
-export const setRelayPolicy = (url: string, read: boolean, write: boolean) => {
-  const list = get(userRelayList) || makeList({kind: RELAYS})
-  const tags = getRelayTags(getListTags(list)).filter(t => normalizeRelayUrl(t[1]) !== url)
-
-  if (read && write) {
-    tags.push(["r", url])
-  } else if (read) {
-    tags.push(["r", url, "read"])
-  } else if (write) {
-    tags.push(["r", url, "write"])
-  }
-
-  return publishThunk({
-    event: makeEvent(list.kind, {tags}),
-    relays: [url, ...INDEXER_RELAYS, ...Router.get().FromUser().getUrls(), ...get(userSpaceUrls)],
-  })
-}
-
-export const setMessagingRelayPolicy = (url: string, enabled: boolean) => {
-  const list = get(userMessagingRelayList) || makeList({kind: MESSAGING_RELAYS})
-
-  // Only update messaging policies if they already exist or we're adding them
-  if (enabled || getRelaysFromList(list).includes(url)) {
-    const tags = getRelayTags(getListTags(list)).filter(t => normalizeRelayUrl(t[1]) !== url)
-
-    if (enabled) {
-      tags.push(["relay", url])
-    }
-
-    return publishThunk({
-      event: makeEvent(list.kind, {tags}),
-      relays: [...INDEXER_RELAYS, ...Router.get().FromUser().getUrls(), ...get(userSpaceUrls)],
-    })
-  }
-}
-
 // Relay access
 
 export const canEnforceNip70 = async (url: string) => {
diff --git a/src/app/core/sync.ts b/src/app/core/sync.ts
index 9c7d70b7..e0beeef3 100644
--- a/src/app/core/sync.ts
+++ b/src/app/core/sync.ts
@@ -41,6 +41,7 @@ import {
   loadRelayList,
   loadMessagingRelayList,
   loadBlossomServerList,
+  loadBlockedRelayList,
   loadFollowList,
   loadMuteList,
   loadProfile,
@@ -215,6 +216,7 @@ const syncUserData = () => {
       loadAlerts($userRelayList.event.pubkey)
       loadAlertStatuses($userRelayList.event.pubkey)
       loadBlossomServerList($userRelayList.event.pubkey)
+      loadBlockedRelayList($userRelayList.event.pubkey)
       loadFollowList($userRelayList.event.pubkey)
       loadGroupList($userRelayList.event.pubkey)
       loadMuteList($userRelayList.event.pubkey)
@@ -229,13 +231,13 @@ const syncUserData = () => {
       await sleep(1000)
 
       await Promise.all(
-        pubkeys.map(async pk => {
-          await loadRelayList(pk)
-          await loadGroupList(pk)
-          await loadProfile(pk)
-          await loadFollowList(pk)
-          await loadMuteList(pk)
-        }),
+        pubkeys.flatMap(pk => [
+          loadRelayList(pk),
+          loadGroupList(pk),
+          loadProfile(pk),
+          loadFollowList(pk),
+          loadMuteList(pk),
+        ]),
       )
     }
   })
diff --git a/src/app/util/policies.ts b/src/app/util/policies.ts
index a989ac08..a1bc1b91 100644
--- a/src/app/util/policies.ts
+++ b/src/app/util/policies.ts
@@ -1,4 +1,5 @@
 import {on, always, call, dissoc, assoc, uniq} from "@welshman/lib"
+import {RelayMode} from "@welshman/util"
 import type {Socket, RelayMessage, ClientMessage} from "@welshman/net"
 import {
   makeSocketPolicyAuth,
@@ -13,7 +14,7 @@ import {
   isClientNegOpen,
   isClientNegClose,
 } from "@welshman/net"
-import {sign} from "@welshman/app"
+import {sign, pubkey, getPubkeyRelays} from "@welshman/app"
 import {
   userSettingsValues,
   getSetting,
@@ -23,6 +24,22 @@ import {
 
 export const authPolicy = makeSocketPolicyAuth({sign, shouldAuth: always(true)})
 
+export const blockPolicy = (socket: Socket) => {
+  const previousOpen = socket.open
+
+  socket.open = () => {
+    const $pubkey = pubkey.get()
+
+    if (!$pubkey || !getPubkeyRelays($pubkey, RelayMode.Blocked).includes(socket.url)) {
+      return previousOpen()
+    }
+  }
+
+  return () => {
+    socket.open = previousOpen
+  }
+}
+
 export const trustPolicy = (socket: Socket) => {
   const buffer: RelayMessage[] = []
 
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 2d1700de..06590a88 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -26,7 +26,7 @@
   import {setupHistory} from "@app/util/history"
   import {setupTracking} from "@app/util/tracking"
   import {setupAnalytics} from "@app/util/analytics"
-  import {authPolicy, trustPolicy, mostlyRestrictedPolicy} from "@app/util/policies"
+  import {authPolicy, blockPolicy, trustPolicy, mostlyRestrictedPolicy} from "@app/util/policies"
   import {kv, db} from "@app/core/storage"
   import {userSettingsValues} from "@app/core/state"
   import {syncApplicationData} from "@app/core/sync"
@@ -43,7 +43,7 @@
 
   const {children} = $props()
 
-  const policies = [authPolicy, trustPolicy, mostlyRestrictedPolicy]
+  const policies = [authPolicy, blockPolicy, trustPolicy, mostlyRestrictedPolicy]
 
   // Add stuff to window for convenience
   Object.assign(window, {
diff --git a/src/routes/settings/relays/+page.svelte b/src/routes/settings/relays/+page.svelte
index a3c0bf23..e6a62016 100644
--- a/src/routes/settings/relays/+page.svelte
+++ b/src/routes/settings/relays/+page.svelte
@@ -1,6 +1,16 @@
 <script lang="ts">
   import {onMount} from "svelte"
-  import {pubkey, getRelayLists, getMessagingRelayLists, derivePubkeyRelays} from "@welshman/app"
+  import {
+    pubkey,
+    getRelayLists,
+    derivePubkeyRelays,
+    addRelay,
+    removeRelay,
+    addBlockedRelay,
+    removeBlockedRelay,
+    addMessagingRelay,
+    removeMessagingRelay,
+  } from "@welshman/app"
   import {RelayMode} from "@welshman/util"
   import Icon from "@lib/components/Icon.svelte"
   import Button from "@lib/components/Button.svelte"
@@ -9,43 +19,42 @@
   import RelayAdd from "@app/components/RelayAdd.svelte"
   import {pushModal} from "@app/util/modal"
   import {discoverRelays} from "@app/core/requests"
-  import {setRelayPolicy, setMessagingRelayPolicy} from "@app/core/commands"
   import Globus from "@assets/icons/globus.svg?dataurl"
   import Inbox from "@assets/icons/inbox.svg?dataurl"
   import Mailbox from "@assets/icons/mailbox.svg?dataurl"
+  import ForbiddenCircle from "@assets/icons/forbidden-circle.svg?dataurl"
   import CloseCircle from "@assets/icons/close-circle.svg?dataurl"
   import AddCircle from "@assets/icons/add-circle.svg?dataurl"
 
   const readRelayUrls = derivePubkeyRelays($pubkey!, RelayMode.Read)
   const writeRelayUrls = derivePubkeyRelays($pubkey!, RelayMode.Write)
+  const blockedRelayUrls = derivePubkeyRelays($pubkey!, RelayMode.Blocked)
   const messagingRelayUrls = derivePubkeyRelays($pubkey!, RelayMode.Messaging)
 
-  const addReadRelay = () =>
+  const addReadRelays = () =>
     pushModal(RelayAdd, {
       relays: readRelayUrls,
-      addRelay: (url: string) => setRelayPolicy(url, true, $writeRelayUrls.includes(url)),
+      addRelay: (url: string) => addRelay(url, RelayMode.Read),
     })
 
-  const addWriteRelay = () =>
+  const addWriteRelays = () =>
     pushModal(RelayAdd, {
       relays: writeRelayUrls,
-      addRelay: (url: string) => setRelayPolicy(url, $readRelayUrls.includes(url), true),
+      addRelay: (url: string) => addRelay(url, RelayMode.Write),
     })
 
-  const addMessagingRelay = () =>
-    pushModal(RelayAdd, {
-      relays: messagingRelayUrls,
-      addRelay: (url: string) => setMessagingRelayPolicy(url, true),
-    })
+  const addBlockedRelays = () =>
+    pushModal(RelayAdd, {relays: blockedRelayUrls, addRelay: addBlockedRelay})
 
-  const removeReadRelay = (url: string) => setRelayPolicy(url, false, $writeRelayUrls.includes(url))
+  const addMessagingRelays = () =>
+    pushModal(RelayAdd, {relays: messagingRelayUrls, addRelay: addMessagingRelay})
 
-  const removeWriteRelay = (url: string) => setRelayPolicy(url, $readRelayUrls.includes(url), false)
+  const removeReadRelay = (url: string) => removeRelay(url, RelayMode.Read)
 
-  const removeMessagingRelay = (url: string) => setMessagingRelayPolicy(url, false)
+  const removeWriteRelay = (url: string) => removeRelay(url, RelayMode.Write)
 
   onMount(() => {
-    discoverRelays([...getRelayLists(), ...getMessagingRelayLists()])
+    discoverRelays(getRelayLists())
   })
 </script>
 
@@ -77,7 +86,7 @@
       {:else}
         <p class="text-center text-sm">No relays found</p>
       {/each}
-      <Button class="btn btn-primary mt-2" onclick={addWriteRelay}>
+      <Button class="btn btn-primary mt-2" onclick={addWriteRelays}>
         <Icon icon={AddCircle} />
         Add Relay
       </Button>
@@ -109,7 +118,7 @@
       {:else}
         <p class="text-center text-sm">No relays found</p>
       {/each}
-      <Button class="btn btn-primary mt-2" onclick={addReadRelay}>
+      <Button class="btn btn-primary mt-2" onclick={addReadRelays}>
         <Icon icon={AddCircle} />
         Add Relay
       </Button>
@@ -142,7 +151,38 @@
       {:else}
         <p class="text-center text-sm">No relays found</p>
       {/each}
-      <Button class="btn btn-primary mt-2" onclick={addMessagingRelay}>
+      <Button class="btn btn-primary mt-2" onclick={addMessagingRelays}>
+        <Icon icon={AddCircle} />
+        Add Relay
+      </Button>
+    </div>
+  </Collapse>
+  <Collapse class="card2 bg-alt column gap-4 shadow-md">
+    {#snippet title()}
+      <h2 class="flex items-center gap-3 text-xl">
+        <Icon icon={ForbiddenCircle} />
+        Blocked Relays
+      </h2>
+    {/snippet}
+    {#snippet description()}
+      <p class="text-sm">
+        These relays will never be connected to by clients supporting this policy.
+      </p>
+    {/snippet}
+    <div class="column gap-2">
+      {#each $blockedRelayUrls.sort() as url (url)}
+        <RelayItem {url}>
+          <Button
+            class="tooltip flex items-center"
+            data-tip="Stop using this relay"
+            onclick={() => removeBlockedRelay(url)}>
+            <Icon icon={CloseCircle} />
+          </Button>
+        </RelayItem>
+      {:else}
+        <p class="text-center text-sm">No relays found</p>
+      {/each}
+      <Button class="btn btn-primary mt-2" onclick={addBlockedRelays}>
         <Icon icon={AddCircle} />
         Add Relay
       </Button>