diff --git a/django_mailbox/transports/generic.py b/django_mailbox/transports/generic.py
index 6fc939c..7738b8c 100644
--- a/django_mailbox/transports/generic.py
+++ b/django_mailbox/transports/generic.py
@@ -28,4 +28,5 @@ class GenericFileMailbox(EmailTransport):
                 continue
             repository.remove(key)
             yield message
+        repository.flush()
         repository.unlock()