45.1. Introduction to Procmail
Procmail is a powerful program for filtering and redirecting email that would normally be sent to users' mailboxes. It can be used at both the system level to filter message for all users on your system, on a per-user basis, or both. Unlike normal Sendmail aliases, Procmail can be used to deliver messages differently depending on their headers and content. This makes it an excellent tool for blocking unwanted email, such as Spam.
When installed on a system, Procmail effectively replaces the normal mail.local email delivery command that Sendmail and other MTAs run to append a message to a user's mail file. Even though it is most commonly used with Sendmail, other MTAs such as Qmail and Postfix can be configured to ...
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