I've got an issue that has me completely stumped.... Using phpBB with mail2forums and Mailman. The phpBB end of things appears to be working fine, with one accept ion.
When an email is made to the list, it goes through a registered user and gets posted to the forums just fine. But then it appears that the phpBB/mail2forum detects the "new" post, and sends that back to the list.
So anyone using posts to the list via email show up in email twice and once on the forums. Posts made directly to the forums show up once in the forums, once in email.