For some reason mailman3 is shunting emails from the releng user about branched/rawhide composes.
They are going to both test and devel list, and they arrive fine on test, but get shunted on devel:
{{{ Feb 29 10:55:11 2016 (26287) SHUNTING: 1456743311.5216613+c4746f106fb3273a5518538425fc2c54a95c9578 Feb 29 10:55:11 2016 (26287) ACCEPT: 20160229105453.GA75526@rawhide-composer.phx2.fedoraproject.org Feb 29 10:55:28 2016 (26284) HyperKitty archived message 20160229105453.GA75526@rawhide-composer.phx2.fedoraproject.org to http://lists.fedoraproject.org/archives/list/test@lists.fedoraproject.org/message/I6LTPDU2MSTVIKTN7EI3SBMXIAYMHSSS/ }}}
Might be some different setting on the two lists?
Hmm, I see a lot of compose message being shunted, but I think that it's because of this issue: https://gitlab.com/mailman/mailman/issues/176
I'll keep investigating.
I believe I have found the issue, which is https://gitlab.com/mailman/mailman/issues/203. The "approved" rule was not properly protected against unknown charsets, and only activates on lists which have a moderation password set, such as devel.
I have deployed the fix to prod and will check that no other compose messages get shunted. I could unshunt previous messages to get Mailman to process them, but I can't select which ones and there are many messages shunted for other reasons since the install, thus it's likely to create a high load on the server. I'll try to do that when more people are asleep.