On Tue, Mar 07, 2017, Eric Smith via cctalk wrote: > On Tue, Mar 7, 2017 at 2:48 AM, Christian Corti via cctalk < > cctalk@classiccmp.org> wrote: > > > And cctalk@... is neither responsible for the writing of the message nor > > does it belong to the author of the message. But replies should be directed > > there, so there should be a Reply-To: field containing cctalk@... and the > > From: field should contain the author's address. > > > > And thus we come full circle. The "From:" header containing the original > author's address is the cause of the unsubscribes due to bounces, and (I > assume) the motivation for the recent change to the list behavior. > > The problem is that major production MTAs will reject (bounce) email with a > "From:" whose domain uses DKIM or SPF, when the sending MTA isn't in the > DKIM or SPF authorized sender list. This will almost always be true when > messages are forwarded by a mailing list. Since the bounces go back to the > mailing list, the mailing list software then drops the entirely legitimate > list subscriber's subscription. :-( > > The behavior you describe is certainly correct according to the RFCs, but > unfortunately now falls apart in practice. :-(
What makes it so that other mailing lists don't unsubscribe people when bounces occur? -- Eric Christopherson