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Postfix Documentation
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Rejecting Unknown Local Recipients with Postfix


As of Postfix version 2.0, the Postfix SMTP server rejects mail for unknown recipients in local domains (domains that match $ mydestination or the IP addresses in $ inet_interfaces or $ proxy_interfaces) with "User unknown in local recipient table". This feature was optional with earlier Postfix versions.

The good news is that this keeps undeliverable mail out of your queue, so that your mail queue is not clogged up with undeliverable MAILER-DAEMON messages.

The bad news is that it may cause mail to be rejected when you upgrade from a Postfix system that was not configured to reject mail for unknown local recipients.

This document describes what steps are needed in order to reject unknown local recipients correctly.

Postfix Documentation
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