Procmail is a mail delivery agent (MDA) or mail filter, a program to process incoming emails on a computer, widely used on Unix systems. It is typically invoked from an MTA like Sendmail; this makes the mailprocessing event-driven. The companion-tool formail allows procmail to be used in batch-processing on mail that already is in your mailbox.

Common operations carried out with procmail include filtering and sorting of emails into different folders according to keywords in from, to, subject or text of the mail, or sending autoreplies, but more sophisticated operations are also possible.

A common practice is to let procmail call an external spam filter program, such as SpamAssassin.

External links

• Official website