I get a lot of spam with a subject line that contains characters from
a non-Western character set. Since I can't read them, it's SPAM to
me. Here is a recipe that I use to trash those messages.

# ===============================================
# Copied from junkfilter.four
# Kill messages with non-English (latin-1, iso-8859-1) characters in
subjects.
# Kill it if:
# - the subject has characters not in the range [ -~] or
# - the subject starts with "=\?[bB]ig5"
#
# Here is a test:
# egrep "^Subject:[ -~]*[^ -~]+|^Subject:[ ]*=\?[bB]ig5\?"
:0
* ^Subject:[ -~]*[^ -~]+\
|^Subject:[ ]*=\?[bB]ig5\?
{ JFMATCH="$JFSEC: Subject contains data in non-western charset"
INCLUDERC=$JFDIR/junkfilter.match }

# ===============================================

Hope it's useful to some.

Dave