diff --git a/django_mailbox/admin.py b/django_mailbox/admin.py
index 045877d..4d489b1 100644
--- a/django_mailbox/admin.py
+++ b/django_mailbox/admin.py
@@ -20,11 +20,7 @@ logger = logging.getLogger(__name__)
 
 
 def get_new_mail(mailbox_admin, request, queryset):
-    count = 0
-    for mailbox in queryset.all():
-        logger.debug('Receiving mail for %s' % mailbox)
-        count += sum(1 for i in mailbox.get_new_mail())
-    logger.debug('Received %d %s.', count, 'mails' if count != 1 else 'mail')
+    queryset.get_new_mail()
 
 
 get_new_mail.short_description = _('Get new mail')
diff --git a/django_mailbox/models.py b/django_mailbox/models.py
index 4e5b111..69a1d0c 100644
--- a/django_mailbox/models.py
+++ b/django_mailbox/models.py
@@ -36,9 +36,23 @@ from django_mailbox.transports import Pop3Transport, ImapTransport, \
 logger = logging.getLogger(__name__)
 
 
+class MailboxQuerySet(models.QuerySet):
+    def get_new_mail(self):
+        count = 0
+        for mailbox in self.all():
+            logger.debug('Receiving mail for %s' % mailbox)
+            count += sum(1 for i in mailbox.get_new_mail())
+        logger.debug('Received %d %s.', count, 'mails' if count != 1 else 'mail')
+
+
+class MailboxManager(models.Manager):
+    def get_queryset(self):
+        return MailboxQuerySet(self.model, using=self._db)
+
+
 class ActiveMailboxManager(models.Manager):
     def get_queryset(self):
-        return super().get_queryset().filter(
+        return MailboxQuerySet(self.model, using=self._db).filter(
             active=True,
         )
 
@@ -106,7 +120,7 @@ class Mailbox(models.Model):
         null=True
     )
 
-    objects = models.Manager()
+    objects = MailboxManager()
     active_mailboxes = ActiveMailboxManager()
 
     @property
diff --git a/django_mailbox/tests/test_mailbox.py b/django_mailbox/tests/test_mailbox.py
index b55e70c..e233f75 100644
--- a/django_mailbox/tests/test_mailbox.py
+++ b/django_mailbox/tests/test_mailbox.py
@@ -34,3 +34,13 @@ class TestMailbox(TestCase):
         self.assertEqual(mailbox.last_polling, None)
         list(mailbox.get_new_mail())
         self.assertNotEqual(mailbox.last_polling, None)
+
+    def test_queryset_get_new_mail(self):
+        mailbox = Mailbox.objects.create(uri="mbox://" + os.path.join(
+                os.path.dirname(__file__),
+                'messages',
+                'generic_message.eml',
+            ))
+        Mailbox.objects.filter(pk=mailbox.pk).get_new_mail()
+        mailbox.refresh_from_db()
+        self.assertNotEqual(mailbox.last_polling, None)