lib/email.dart

@@ -106,6 +106,10 @@ class _EmailListScreenState extends State<EmailListScreen> {
                           icon: Icon(Icons.mark_email_read_outlined),
                           onPressed: () {
                             //mark email as read
+                            setState(() {
+                              widget.emails[index].seen = true;
+                              ApiService().markAsSeen(email.id);
+                            });
                           },
                         ),
                         IconButton(

lib/structs.dart

@@ -11,7 +11,7 @@ class GetThreadResponse {
   final String from_name;
   final String from_address;
   final List<MailAddress> to;
-  final bool seen;
+  late bool seen;
 
   GetThreadResponse({
     required this.id,