Allow checking for ticket IDs in all queues regardless of email submission settings

This change allows Django Helpdesk to locate existing tickets in any queue that
has email configured, even if that queue doesn't accept new ticket submissions.

helpdesk/email.py

@@ -1096,10 +1096,11 @@ def extract_email_metadata(
     )
 
     # If no ticket ID found in the current queue, check all other queues
+    original_queue = queue  # Store the original queue in case we need to revert
     if ticket_id is None:
-        # Get all enabled queues except the current one
+        # Get all enabled queues except the current one, regardless of allow_email_submission
         other_queues = Queue.objects.exclude(id=queue.id).filter(
-            email_box_type__isnull=False, allow_email_submission=True
+            email_box_type__isnull=False
         )
         
         for other_queue in other_queues:
@@ -1114,6 +1115,11 @@ def extract_email_metadata(
                 )
                 queue = other_queue
                 break
+        
+        # If no ticket ID was found in any queue, revert to the original queue for new ticket
+        if ticket_id is None:
+            queue = original_queue
+            logger.info(f"No existing ticket found, reverting to original queue {queue.slug}")
 
     files = []
     # first message in thread, we save full body to avoid losing forwards and things like that