Be sure to pass the condition on through to the underlying transport.

django_mailbox/models.py

@@ -393,7 +393,7 @@ class Mailbox(models.Model):
         connection = self.get_connection()
         if not connection:
             return new_mail
-        for message in connection.get_message():
+        for message in connection.get_message(condition):
             msg = self.process_incoming_message(message)
             new_mail.append(msg)
         return new_mail

django_mailbox/tests/test_integration_imap.py

@@ -3,7 +3,6 @@ import uuid
 
 from six.moves.urllib import parse
 
-from django.conf import settings
 from django.core.mail import EmailMultiAlternatives
 
 from django_mailbox.models import Mailbox