I'm trying to set up a virtual server with a website only, but no mail handling. Mail shall be handled by a different server, my customer's regular mail server.
This works fine, except when I try to send an email from my server to that domain. Then my Postfix accepts my mail, but sends me this error message immediately:
The mail system
: mail for somedomain.de loops back to myself
Reporting-MTA: dns; myserversdomain.de
X-Postfix-Sender: rfc822; email@example.com
Arrival-Date: Mon, 15 Jun 2009 22:07:37 +0200 (CEST)
Final-Recipient: rfc822; firstname.lastname@example.org
Original-Recipient: rfc822; email@example.com
Diagnostic-Code: X-Postfix; mail for somedomain.de loops back to myself
So I guess my server tries to find that domain's mail server, but my server's Bind tells my Postfix to handle mail by itself.
The MX record for somedomain.de is setup correctly (in public worldwide DNS).
What can I do to let my server use my customer's mail server to deliver mail?
Thanks and best regards,