diff --git a/lib/screens/manage_collection_screen.dart b/lib/screens/manage_collection_screen.dart
index 27976be..5119ce7 100644
--- a/lib/screens/manage_collection_screen.dart
+++ b/lib/screens/manage_collection_screen.dart
@@ -167,10 +167,17 @@ class _ManageCollectionScreenState extends State<ManageCollectionScreen> {
 
     if (result != true) return;
 
+    final email = emailCtrl.text.trim();
+    final emailRegex = RegExp(r'^[^@\s]+@[^@\s]+\.[^@\s]+$');
+    if (!emailRegex.hasMatch(email)) {
+      showGlobalSnackBar('Please enter a valid email address.', isError: true);
+      return;
+    }
+
     try {
       await CollectionService.inviteByEmail(
         collectionId: _collection.id,
-        email: emailCtrl.text.trim(),
+        email: email,
       );
       showGlobalSnackBar('Member invited!');
       _loadMembers();