diff --git a/src/components/message/MessagingPage.tsx b/src/components/message/MessagingPage.tsx
index 1d66bf3..4faf37f 100644
--- a/src/components/message/MessagingPage.tsx
+++ b/src/components/message/MessagingPage.tsx
@@ -153,7 +153,6 @@ export function MessagingPage({ initialConversationId, initialAgentProfileId }:
 
   const [searchQuery, setSearchQuery] = useState('');
   const [isPageMenuOpen, setIsPageMenuOpen] = useState(false);
-  const [isAllMuted, setIsAllMuted] = useState(false);
   const [confirmDeleteId, setConfirmDeleteId] = useState<string | null>(null);
   const [isUploading, setIsUploading] = useState(false);
   const [showScrollButton, setShowScrollButton] = useState(false);
@@ -488,6 +487,13 @@ export function MessagingPage({ initialConversationId, initialAgentProfileId }:
     setConfirmDeleteId(null);
   }, [confirmDeleteId, deleteConversation]);
 
+  // True only when every conversation is currently muted for this user's role.
+  const isAllMuted =
+    conversations.length > 0 &&
+    conversations.every((c) =>
+      userRole === 'AGENT' ? c.agentMuted : c.userMuted,
+    );
+
   // Page header menu items
   const pageMenuItems: DropdownMenuItem[] = [
     {
@@ -498,7 +504,21 @@ export function MessagingPage({ initialConversationId, initialAgentProfileId }:
     },
     {
       label: isAllMuted ? 'Unmute All Notifications' : 'Mute All Notifications',
-      onClick: () => setIsAllMuted((prev) => !prev),
+      onClick: async () => {
+        const targetMuted = !isAllMuted;
+        // Flip every conversation whose current mute state doesn't match the target
+        const tasks = conversations
+          .filter((c) => {
+            const current = userRole === 'AGENT' ? c.agentMuted : c.userMuted;
+            return !!current !== targetMuted;
+          })
+          .map((c) => toggleMute(c.id, targetMuted));
+        try {
+          await Promise.all(tasks);
+        } catch (err) {
+          console.error('Failed to toggle mute on all conversations:', err);
+        }
+      },
     },
   ];