SPAM Filtering
For those users who wish to filter out or fine tune spam filtering to their inbox, try using SpamAssassin. The following needs to be placed in your ~/.forward file. This file needs be world readable.
"|IFS=' ' && exec /usr/local/bin/procmail -f- || exit 75 #username"
where username is your unix userid. Then create a file called ~/.procmailrc and insert the following:
# SpamAssassin sample procmailrc
#
# The condition line ensures that only messages smaller than 250 KB
# (250 * 1024 = 256000 bytes) are processed by SpamAssassin. Most spam
# isn't bigger than a few k and working with big messages can bring
# SpamAssassin to its knees.
#
# The lock file ensures that only 1 SpamAssassin invocation happens
# at 1 time, to keep the load down.
#
:0fw: spamassassin.lock
* < 256000
| spamassassin
# Mails with a score of 15 or higher are almost certainly spam (with 0.05%
# false positives according to rules/STATISTICS.txt). Put them in a
# different mbox. (This one is optional.)
:0:
* ^X-Spam-Level: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
almost-certainly-spam
# All mail tagged as spam (eg. with a score higher than the set threshold)
# is moved to "probably-spam".
:0:
* ^X-Spam-Status: Yes
probably-spam
# Work around procmail bug: any output on stderr will cause the "F" in "From"
# to be dropped. This will re-add it.
:0
* ^^rom[ ]
{
LOG="*** Dropped F off From_ header! Fixing up. "
:0 fhw
| sed -e '1s/^/F/'
}
For more information, please see the FAQ Using Spam Assassin at http://www.spamassassin.org.