I have been a happy SpamSieve user for at least 3 years. For 2.75 years, I could say “I don’t get SPAM”. Recently, I have become a little disappointed. SPAM messages consisting of a single embedded jpg image are getting past SpamSieve at least 30% of the time.
A message with those attributes is almost certainly SPAM. Why is SpamSieve so easily fooled? Particularly since it used to be more than 99% accurate!