Postfix Virtual Domain Hosting Howto

Purpose of this document

This document requires Postfix version 2.0 or later.

This document gives an overview of how Postfix can be used for hosting multiple Internet domains, both for final delivery on the machine itself and for the purpose of forwarding to destinations elsewhere.

The text not only describes delivery mechanisms that are built into Postfix, but also gives pointers for using non-Postfix mail delivery software.

The following topics are covered:

• Canonical versus hosted versus other domains
• Local files versus network databases
• As simple as can be: shared domains, UNIX system accounts
• Postfix virtual ALIAS example: separate domains, UNIX system accounts
• Postfix virtual MAILBOX example: separate domains, non-UNIX accounts
• Non-Postfix mailbox store: separate domains, non-UNIX accounts
• Mail forwarding domains
• Mailing lists
• Autoreplies