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Absolute FreeBSD, 2nd Edition by Michael W. Lucas

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Virtual Domains

By default, Sendmail rejects all email not destined for the local host. This works if your local host has the same name as your domain—that is, if the mail server for absolutefreebsd.com is a machine actually named absolutefreebsd.com. Frequently, that's not the case. For example, the mail server for absolutefreebsd.comis a machine named bewilderbeast.blackhelicopters.org. With email systems, a virtual domain allows a server to receive email for a different domain. One FreeBSD machine can handle hundreds or thousands of virtual domains.

Configuring a virtual domain has three steps. First, tell the mail server that it is responsible for a domain's email. Then, redirect email for users in that domain to the appropriate accounts. Finally, ...

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