37.4. Managing Email Aliases
A mail alias specifies that email received by your server for a particular mailbox should be forwarded to a different destination instead. That destination can be another email address, a file of addresses, a local file, or even the input to a program. They can be useful for setting up pseudo mailboxes that actually send email to a real person, such as sales@example.com or webmaster@example.com. An alias can have the same name as a UNIX user, in which case it will intercept all mail to that user and forward it to a different destination.
On most operating systems, Sendmail has several aliases defined by default for system users like bin, nobody, and uucp, all of which forward mail to root. There will also be a postmaster ...
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