This page describes how to use Procmail to filter mail. It includes HCoop-specific instructions and a sample .procmail.d/procmailrc file with comments.

Introduction

Procmail instructions are kept in the ~/.procmail.d/procmailrc file. You should have a directory under your home AFS directory called .procmail.d. To activate procmail, simply create a file in that directory called procmailrc.

Since we like to document by means of an example, the remainder of these instructions focus on two specific example ~/.procmail.d/procmailrc files.

Points to keep in mind

• It is highly recommend to put your procmail log in ~/.logs/mail/procmail.log rather than elsewhere.

• Use appropriate values for the HOME, MAILDIR, and DEFAULT options, based on those used in the examples.

What do these examples do?

• Separates mail into different folders based on who it is from or who it is addressed to.
• If an email message did not get checked by the central spamassassin daemon, make sure it gets checked. It calls the client program instead of starting another spamassassin process. Most messages have already been checked -- these we don't touch. Occasionally spamassassin misses checking a message or two, somehow.

What do these examples not do?

• Force spam checking with a custom set of rules. The admins do not recommend checking spam with custom rules, since it causes spamassassin to be invoked twice for each message.

• This file can be split into smaller task-based files, but this is not done in the example.

Example 1: MichaelOlson's setup

# Example procmailrc filters
#
# We use a maildir here at hcoop.net
MAILDIR=$HOME/Maildir
DEFAULT=$MAILDIR/

# If you want to keep track of where mail has been delivered,
# uncomment this.  If enabled, be sure to trim this file once
# in a while (using cron is one way), because otherwise it can
# grow quite large.  It is strongly recommended to use the
# path given here, so that the logs gets placed in a writable
# location.
#LOGFILE=$HOME/.logs/mail/procmail.log

# See the manpages `procmailrc' and `procmailex' for explanations
# of the syntax involved.

# The following 2 rules come before the spam rules because we
# want to make sure that email from these people get through.
# It's a form of whitelisting.

# Stuff from the family
:0
* ^From.*(familymember1@msn|familymember2@yahoo)
.Family/

# Work-related
:0
* ^From.*person@somecollege
.Work/

# All mail tagged as spam (eg. with a score higher than the set
# threshold) is definitely spam.
:0
* ^X-Spam-Status: Yes
.Spam.Definitely/

# If it scores 3 or better, it's probably spam.
:0
* ^X-Spam-Level: \*\*\*
.Spam.Probably/

# The Debian Bug-Tracking System forwards me a copy of each bug report
# I send in.  Since I don't already have a copy of this report, put it
# in my Sent box.
:0
* ^From:.*me@hcoop\.net
* ^To:.*submit@bugs\.debian\.org
.Sent/

# Local mail (error messages and the like)
:0
* ^(To:|From).*local\.domain\.org
.Local/

# Vending stuff
:0
* ^To:.*me(\+|_)vending@domain\.org
.Vending/

# School-related
:0
* ^To:.*me\+school@domain\.org
.School/

# Crap sent to all students
:0
* ^(To|Cc):.*[Rr]-[Uu]sers_
.Spam.Ignore/

# Bug reports
:0
* ^(From|To|C[c]):.*(bugs\.debian\.org|bugzilla\.)
.Bugs/

# LifeReader mailing list
:0
* ^(From|To|C[c]):.*liferea-devel@lists
.Lists.LifeRea/

# Neki_Fujiyama (Samurai Pizza Cats) list
:0
* ^(From|To|C[c]):.*[Nn]eko_[Ff]ujiyama@yahoogroups
.Lists.Neko_Fujiyama/

# Hcoop mailing list
:0
* ^To:.*users@hcoop
.Lists.HCoop/

# InfoWorld newsletters
:0
* ^From.*@newsletter\.infoworld
.Lists/

# Other lists
:0
* ^(From|To|C[c]):.*(@lists\.|@yahoogroups)
.Lists/

# Anything I've sent should go to Test
:0
* ^From:.*(mwolson@|@mwolson\.org)
.Test/

Example 2: JustinLeitgeb's setup

I based my .procmailrc on the file above. However, I don't trust my procmail coding skills, so I had procmail create a log file of the messages that it receives, as well as a backup copy of each message for testing purposes. I also decided that the "Sender:" field is the best one to use for the lists that I receive, so I filter on this field. I took code in my .procmailrc from the "procmailex" man page, which I highly recommend.

I created the directory "log" in my home directory for the log file before putting the .procmailrc in place. I also created the folders to which mail would be filtered in thunderbird, although I'm not absolutely sure if this step is necessary.

Note that you should probably comment out the "backup" section once you're sure that your code works in order to save space. You will also have to rotate or truncate the procmail log file manually, or write a script for cron to use.

## JustinLeitgeb .procmailrc
## Modified Sun Apr 15 01:41:34 EDT 2007

# We use a maildir here at hcoop.net
MAILDIR=$HOME/Maildir
DEFAULT=$MAILDIR/

# Create a log file
LOGFILE=$HOME/.logs/mail/procmail.log

# Make a backup of all mail that we'll wipe out when we're sure that 
# filtering is working correctly.
:0 c    
.backup/

## Filter all of the mailing lists that we get into different
## folders.

# CFP (call for papers) list
:0
* ^Sender.*owner-cfp@lists.sas.upenn.edu
.lists.CFP/

# plone-users
:0
* ^Sender.*plone-users-bounces@lists.sourceforge.net
.lists.plone-users/

# nflug
:0
* ^Sender.*nflug-bounces@nflug.org
.lists.nflug/

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