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crb
Asked: 2010-01-20 10:44:00 +0800 CST

Restrict Postfix delivery options for local messages via sendmail/postdrop

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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?

email postfix email-server

1 Answers

  1. Best Answer

    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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