The same script that generates the global whitelist on lists.mozilla.org that allows subscribers of any list to post to any of them is supposed to also include the membership of all of the @bugzilla.org lists, because of a couple of them also being cross-gatewayed to newsgroups. This appears to be broken, as members of firstname.lastname@example.org (which is cross-gatewayed to email@example.com) are getting "reject" notices from dev-apps-bugzilla.
However, note that my messages aren't actually getting rejected, I just get the reject notices.
Oh, okay. My messages aren't making it to the newsgroup, but they are making it to the mailing list.
I think this entire thing is broken in general (and I'm surprised I haven't heard more noise about it). I just got a reject trying to post to dev-planning (which I'm not a member of) even though I am a member of several other lists on lists.mozilla.org.
The unfortunate timing with the Firefox 4 release (desktop and mobile) plus the AllHands event at Mozilla Mon/Tue this week conspired to prevent time to work on this. Back in catchup mode now, and this is one of the more annoying things on my list so it should be taken care of shortly.
OK, I think this is fixed now. The whitelist was overriding "hold" but it wasn't overriding "reject" or "discard". If anyone finds this still happening please reopen.