On Fri, 13 Nov 2015, Steve Kleene wrote:
> Almost five years ago, I became unable to post questions here by e-mail. The
> e-mail bounces with, for example:
>
> > The following message to <debian-user@lists.debian.org> was undeliverable.
> > The reason for the problem:
> > 5.1.0 - Unknown address error 550-'5.1.7
> <prvs=752320ad2=sk...@syrano.acb.uc.edu>: Sender address rejected:
> undeliverable address: host syrano.acb.uc.edu[129.137.3.161] said: 550 5.1.1
> <prvs=752320ad2=sk...@syrano.acb.uc.edu>... User unknown (in reply to RCPT
> TO comm
> >
> > --4pO84.596/vqwKa.2j26M/gYqU.DibVXRw
> > content-type: message/delivery-status
> >
> > Reporting-MTA: dns; ucmailmx4.uc.edu
> >
> > Final-Recipient: rfc822;debian-user@lists.debian.org
> > Action: failed
> > Status: 5.0.0 (permanent failure)
> > Remote-MTA: dns; [82.195.75.100]
> > Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'5.1.7
> <prvsu2320ad2=sk...@syrano.acb.uc.edu>: Sender address rejected:
> undeliverable address: host syrano.acb.uc.edu[129.137.3.161] said: 550 5.1.1
> <prvsu2320ad2=sk...@syrano.acb.uc.edu>... User unknown (in re
> >
> > --4pO84.596/vqwKa.2j26M/gYqU.DibVXRw
> > content-type: message/rfc822
>
> This commenced about the time my employer started prepending a bounce address
> validation tag ("prvs=752320ad2=" in the above example) to my e-mail address
> on outgoing mails. This fails with the debian lists but nowhere else. I
> have circumvented the problem ever since by posting via gmane.org.
This is because you are not supporting sender callback verification; the
envelope from that you are using needs to be an address which can be
received. If not, it's not valid.
See https://en.wikipedia.org/wiki/Callback_verification for details
--
Don Armstrong http://www.donarmstrong.com
"Do you think you might be suffering from post-traumatic stress
disorder?" [...]
"Who isn't?"
-- Walter Jon Williams _This Is Not A Game_ p121
