This is the spam-filtering procmail script I currently use.

procmailrc:

Sample procmailrc that calls up procvars and spamcheckrc Edit this to suit your own needs, and store it as $HOME/.procmailrc

procvars:

Personalisations to suit the end-user. Includes your email addresses and details of mailing lists and other people you may receive BCC'ed mail from. Put it in directory $HOME/.nospam

spamcheckrc:

The spam filter itself. Probably doesn't need editing. Put it in $HOME/.nospam

rcvdrc:

Subroutine used to examine a single Received: header. Shouldn't need editing. Put it in $HOME/.nospam

spamscore:

Script to evaluate the overall "spam score" of a mail item. The bigger the number, the more likely it's spam. Adds up the scores in the X-Reject: headers added by spamcheckrc. Put it somewhere in your PATH, e.g. $HOME/bin

spamdomain:

Script to evaluate the hostname of the most heavily advertised site in a message. The name is tested for known spammer signs. Put it somewhere in your PATH, e.g. $HOME/bin

payload:

Decides what to do with the message based on the score. I deliver mail with scores <50 normally, mail with scores 50-99 in folder likely-spam as well as delivering it normally, and mail with scores 100+ is just delivered to folder junkmail.

	Name	Last modified	Size	Description
	Parent Directory		-
	README.txt	11-Dec-2001 15:28	1.5K
	payload	24-Nov-2000 00:00	204
	procmailrc	11-Oct-2001 08:26	1.0K
	procvars	24-Sep-2003 10:41	1.5K
	rcvdrc	04-Jul-2006 12:41	5.1K
	spamcheckrc	04-Jul-2006 12:41	89K
	spamdomain	04-Jul-2006 12:41	1.3K
	spamscore	04-Jul-2006 12:41	231