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Procmail


Install

From FreeBSD ports
cd /usr/ports/mail/procmail
make install

Configure

With Sendmail in FreeBSD (inserted at the end of the FEATURE section in /etc/mail/hostname.mc)
FEATURE(local_procmail)

NOTE: If you don't have the file /etc/mail/hostname.mc just run "make all" inside /etc/mail and it will be generated.

Remember to execute this in /etc/mail after saving above change
make all
make install

And restart sendmail:
/etc/rc.d/sendmail restart

Hints

Things to put in file /usr/local/etc/procmailrc:
VERBOSE=on
LOGFILE=/var/log/procmail.log


How to use $MATCH

This variable is assigned to by procmail whenever it is told to extract text from a matching regular expression. It will contain all text matching the regular expression past the "\/" (backslash, slash) token.

Example:
:0 f
* ^Subject: Something, \/([a-zA-Z_\-]+)
| formail -I "Subject: Found $MATCH"

:0 f
* ^From:.*longass@domain.tld.*
| formail -I "From: root@relay.dk"