The patch to Mailman/Utils.py at <https://bugs.launchpad.net/mailman/+bug/1437145/+attachment/4358114/+files/p> can be applied with at most a line number offset to any Mailman 2.1.x version, but the referenced mm_cfg.ACCEPTABLE_LISTNAME_CHARACTERS setting didn't exist before Mailman 2.1.11 so if you are patching an older version, you need to add
The patch to Mailman/Utils.py at <https:/ /bugs.launchpad .net/mailman/ +bug/1437145/ +attachment/ 4358114/ +files/ p> can be applied with at most a line number offset to any Mailman 2.1.x version, but the referenced mm_cfg. ACCEPTABLE_ LISTNAME_ CHARACTERS setting didn't exist before Mailman 2.1.11 so if you are patching an older version, you need to add
ACCEPTABLE_ LISTNAME_ CHARACTERS = '[-+_.=a-z0-9]'
to mm_cfg.py and/or Defaults.py.