How to Set Up the Postmaster Alias

Every system should be able to send mail to a postmaster mailbox. You can create a NIS or NIS+ alias for postmaster or create one in each local /etc/mail/aliases file. Here is the default /etc/mail/aliases entry:

# Following alias is required by the mail protocol, RFC 822
# Set it to the address of a HUMAN who deals with this system's
# mail problems.
Postmaster: root

To create the postmaster alias, edit each system's /etc/mail/aliases file and change root to the mail address of the person who acts as postmaster.

You might want to create a separate mailbox for the postmaster to keep postmaster mail separate from personal mail. If you create a separate mailbox, use the mailbox address instead of the postmaster's mail address when you edit the /etc/mail/aliases files.