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Postfix Documentation
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What Postfix address verification can do for you

Address verification is a feature that allows the Postfix SMTP server to block a sender (MAIL FROM) or recipient (RCPT TO) address until the address has been verified to be deliverable.

The technique has obvious uses to reject junk mail with an unreplyable sender address.

The technique may also be useful to block mail for undeliverable recipients, for example on a mail relay host that does not have a list of all the valid recipient addresses. This prevents undeliverable junk mail from entering the queue, so that Postfix doesn't have to waste resources trying to send MAILER-DAEMON messages back.

This feature is available in Postfix version 2.1 and later.

Topics covered in this document:

Postfix Documentation
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