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/