I'm using this set of rules posted to the list last month. Drop this in /etc/mail/spamassassin as rnd_uc_char.cf.

# $Id: rnd_uc_char.cf,v 1.2 2003/12/19 20:08:50 bjn Exp $
# SpamAssassin RND_UC_CHAR pattern
#
# Thanks to "Christopher X. Candreva" <chris AT westnet DOT com>
# http://marc.theaimsgroup.com/?l=spamassassin-talk&m=107184646319270&w=2
#
# This type of email is generated by some kind of spamware package.
# The first pattern shows where the developer screwed up.  :-)
# The second pattern is where they fixed their bug; we might have
# false-positives there, so use a tight pattern and score it lower.
# The third pattern appears in all emails I've seen of this type.
#
###########################################################################

header SUBJ_RND_UC_CHAR_L       Subject =~ /\%RND_UC_CHAR/
describe SUBJ_RND_UC_CHAR_L     Subject contains literal RND_UC_CHAR tag
score SUBJ_RND_UC_CHAR_L        5.0

header SUBJ_RND_UC_CHAR Subject =~ /^Re:\s[A-Z]{2,},(\d+,)?\s[a-z]+\s[a-z]+\s[a-z]+\s*$/
describe SUBJ_RND_UC_CHAR Subject fits RND_UC_CHAR pattern
score SUBJ_RND_UC_CHAR 2.0


header XOIP_RND_UC_CHAR X-Originating-IP =~ /\[.*\.(com|net|org|biz).*IP\]/
describe XOIP_RND_UC_CHAR X-Originating-IP fits RND_UC_CHAR pattern
score XOIP_RND_UC_CHAR 2.0




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