Recipient-in-subject filter

Here's a rule (based on SPAMMISHNESS rules I've written about previously) 
to flag messages when the recipient username appears in the subject line 
(delimited by wordbreaks, not as a potential substring).

#
# rcpt_subj.rc
#
# 20030708/1132 SBS     Created
#
# SPAM check: detects the recipients username portion in the subject
#

# uses ENVTO (common extraction)

# First (and this only works when there IS an ENVTO), get the username
# portion of the envelope recipient.  The good news is that while the
# envelope-to header won't be added when a message has multiple local
# recipients, this particular test is for the recipient's username in
# the subject, so it shouldn't be delivered to multiple recipients
# anyway.
# If there's a match on the first condition, then check for a
# match of the username in the subject.

:0
* ENVTO ?? ^\/[^(_at_)]+
* $ ^Subject:.*\>$\MATCH\>
{
        SPAMVAL="+(${SPAMTHRESHOLD}*.70)"
        SPAMMISHNESS="${SPAMMISHNESS}${SPAMVAL}"
        SPAMNOTES="${SPAMNOTES}SPAM: ${SPAMVAL} Username in the subject${NL}"
}
---
 Sean B. Straw / Professional Software Engineering

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