Am 2013-04-19 12:28, schrieb nullnullachtfuenfz...@arcor.de:
The problem arises with mail originating from senders in
@B2.example.com to recipients in @A1.example.com.
Because the destination server in A also does a
smtpd_sender_restrictions=reject_unknown_sender_domain and
@B2.example.com is unknown in A´s DNS the sender address is rejected.
The missing MX Record in A´s DNS is ok, because senders in
@B2.example.com are not supposed to participate mail exchange with
@A1.example.com and vice versa.
But where to deliver the bounce?
Why exactly is there a bounce in the first place? If the @A1 MX rejects
mail from @B2 during the SMTP session, it never receives responsibility
for any bounces. Unless of course you accept the mail first and then
decide later to bounce it. But why would you do that?
-Timo
