7 Mar
2017
7 Mar
'17
6:23 p.m.
On Tue, Mar 07, 2017, Eric Smith via cctalk wrote:
On Tue, Mar 7, 2017 at 2:48 AM, Christian Corti via
cctalk <
cctalk at classiccmp.org> wrote:
What makes it so that other mailing lists don't unsubscribe people when
bounces occur?
--
Eric Christopherson
And cctalk at ... 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 at ... 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. :-(