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Special Aliases

The behavior of the sendmail program requires that two specific aliases (postmaster and MAILER-DAEMON) be defined in every aliases file.^[203] Beginning with V8.7 sendmail, aliases that contain a plus character can be used to route mail on the basis of special needs. Also, beginning with V8.7 sendmail, databases that allow duplicates can be declared to help automate the creation of those files.

^[203]^* RFC2142 adds others to this list (RFC2142 Common Mailbox Names on page 474), such as abuse, webmaster, and so on.

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