This bug was fixed a long time ago, so it is no longer valid in the latest versions of Mailman. Old archives could still be affected if you regenerate the archive, but bin/cleanarch should fix up an old mbox file for you.
This bug was fixed a long time ago, so it is no longer valid in the latest versions of Mailman. Old archives could still be affected if you regenerate the archive, but bin/cleanarch should fix up an old mbox file for you.