Postfix Autorespond - "recipient address rejected"

Question

I have an issue with postfix.

If I set up an autorepsonder (I use a postgresql db, so I insert mailbox#[e-mail] into alias table; of course this domain is listed into postfix's transport file) this will work only for local domains.

If I try to send mail from external domains, I receive back Relay access denied;
As last tentative, if I send in a "conventional way" mail to same address that is "denied" with autorespond operation, I'm able to send it without any problem.

Any idea?

Answer 1

Problem was into main.cf postfix's configuration file: $mynetworks does not contain server ip (only localhost: 127.0.0.1) and, so, message was rejected. By adding my server ip address, all works like a charm.