Topicdesk.com has updated their excellent mailbfr tool to version 1.0.4. mailbfr is a utility script for backing up, fixing, and restoring (hence the name) the Mail service on Mac OS X Panther/Tiger/Leopard Server.
This update includes the following change (via the changelog):
Minor bug fix that would prevent restore of mailman configuration files
Of course, mailbfr includes self-update functionality, so if you’ve already installed it you can merely just run it for a prompt to update.