I think what happened, was that before the fix for https://bugs.launchpad.net/flufl.lock/+bug/827052 was made, I was looping through and rejecting all pending messages before removing the list and then the domain. Maybe since I was rejecting instead of discarding, it was generating a bounce message for the virgin queue right before deleting the domain entry. This isn't really a problem any more. Sorry if I got some details wrong, I don't fully understand the Mailman pipeline yet. -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/827547 Title: KeyError in "virgin" runner. To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/827547/+subscriptions