37.2. The Sendmail Configuration Module

Sendmail is the most popular MTA in use on the Internet today and has been since it was first developed. It is included as standard with almost all variants of the UNIX operating system, and works the same on all of them. It has many useful features for routing and processing email, such as aliases, domain routing, and user-creatable forward files.

Sendmail has a one-to-one mapping between UNIX users and mailboxes. Each user has his own mail file, typically in the /var/mail or /var/spool/mail directory. Each time a message is delivered to a user, it is appended to the file with the same name as the user in that directory, such as /var/mail/jcameron. Sendmail has no concept of “mail users.” If you want to ...

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