Yeah, I think this had to be caused by some unsupported external manipulation of the database. The base Runner class will refuse to process any message destined for a mailing list that does not exist, and every mailing list should be associated with an existing domain. I'm going to mark this one incomplete, but if you find a reproducible test case to show the error, please re-open it. ** Changed in: mailman Status: Triaged => Incomplete -- 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