I hate the new mail system

[Eric Christopherson]

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:
> 
> > 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.  :-(

What makes it so that other mailing lists don't unsubscribe people when
bounces occur?

-- 
        Eric Christopherson