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Postfix Documentation
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What are address classes good for?

Why should you care about address classes? This is how Postfix decides what mail to accept, and how to deliver it. In other words, address classes are very important for the operation of Postfix.

An address class is defined by three items.

  • The list of domains that are a member of the class: for example, all local domains, or all relay domains.

  • The default delivery method. For example, the local or smtp delivery agent. This helps to keep Postfix configurations simple.

  • The list of valid recipient addresses for that address class. The Postfix SMTP server rejects invalid recipients with "User unknown in <name of address class here> table". This helps to keep the Postfix queue free of undeliverable MAILER-DAEMON messages.

Postfix Documentation
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