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I have a staging server running Postfix, which I want to only set up to deliver mail to example.org. If we are testing a function that sends e-mail, we want to be able to know that we won't accidentally send any test messages out to anyone outside our test domain.

All mail is sent from this server to a smarthost for delivery.

I have set up

relay_domains = example.org
smtpd_recipient_restrictions = reject_unauth_destination

This means the server only relays for example.org by SMTP. However, using mail(1) on the server, it will deliver for all addresses. How can I restrict this to the relay_domains only?

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Is the domain example.org on the same machine or does it have to be relayed to some other machine ? – proy Jan 19 '10 at 21:53
It has to be relayed to an external smarthost. No local accounts exist on this machine. – crb Jan 20 '10 at 10:05
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1 Answer

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None other than esteemed Postfix author Wietse Venema gives us the answer:

Perhaps with a transport table, taking advantage of its special syntax:

/etc/postfix/main.cf
    transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport:
    example.org :
    *      error:we do not deliver this domain

The above will reject SMTP mail, and bounce local submission, for domains other than example.org.

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