Quanah Gibson-Mount:
> I got a complaint from a client that postfix is returning a "5.0.0" DSN
> when emails are sent to an unknown user. I believe this is to prevent
> backscatter. In any case, it appears this 5.0.0 DSN response is hard coded
> into the error daemon?
>
> >From my logs I see:
>
> Oct 1 13:11:07 zre-ldap002 postfix/smtp[8257]: 000501E37BC:
> to=<badu...@zre-ldap002.eng.vmware.com>, relay=127.0.0.1[127.0.0.1]:10026,
> delay=0.22, delays=0.03/0/0/0.19, dsn=2.0.0, status=sent (250 2.0.0 from
> MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 2D0711E37BE)
> Oct 1 13:11:07 zre-ldap002 postfix/qmgr[23910]: 000501E37BC: removed
> Oct 1 13:11:07 zre-ldap002 postfix/error[8324]: 2D0711E37BE:
> to=<badu...@zre-ldap002.eng.vmware.com>, relay=none, delay=0.06,
> delays=0.03/0/0/0.02, dsn=5.0.0, status=bounced (zre-ldap002.eng.vmware.com)
>
> And in the source I see:
>
> if (strcmp(service, MAIL_SERVICE_ERROR) == 0)
> status = deliver_message(request, "5.0.0", bounce_append);
The error daemon uses "5.0.0" as the **default** status code, when
whoever decided to route mail to the error daemon did not provide
a valid status code.
There are tons of ways that mail can resolve to the error mailer;
some may even be specified in access maps or transport maps.
How does the mail end up with the error mailer in your case? If the
error daemon is specified in a transport or access map, then the
5.1.1 code should be specified there.
Wietse
> The client would rather have 5.1.1 returned, so they can integrate it with
> a Sophos Email Appliance, which is apparently expecting the 5.1.1 response.
>
> I assume there is an easy way to change this behavior I'm just missing. ;)
> I checked the postconf reject codes, and I don't see 500 set anywhere. I
> have:
>
> unknown_local_recipient_reject_code = 550
> unknown_relay_recipient_reject_code = 550
>
> Thanks for any pointers. :)
>
> --Quanah
>
>
> --
>
> Quanah Gibson-Mount
> Sr. Member of Technical Staff
> Zimbra, Inc
> A Division of VMware, Inc.
> --------------------
> Zimbra :: the leader in open source messaging and collaboration
>
