mailinabox

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First a description of what does work: I have a satellite system which relays all outgoing mail to my mail-in-a-box server. That is, on the satellite I have

relayhost = [miab.domain.com]:587

and the appropriate username/password in /etc/postfix/sasl/passwd,

[miab.domain.com]:587 [email protected]:securepassword

If I setup an alias [email protected] on my miab server and give [email protected] permission to send as that alias, this works fine, and the satellite can send email claiming to be from that alias. All good.

However, if I now open a second submission port, by adding to /etc/postfix/master.cf the line

 5870      inet  n       -       y       -       -       smtpd

and change 587 -> 5870 in the configuration on the satellite system, then I can still send email from the satellite system as [email protected], but only to domains served by the miab server. It refuses to send emails to the rest of the world, with a Relay access denied message.

Any ideas? Should I do something different to enable posting on a non-standard port? (I need this because the satellite system has outgoing traffic to port 587 blocked).

Apologies if this is not a mail-in-a-box issue.