 The simple countermeasure of disabling remote images (web bugs) in emails eliminates this problem.At the Conference on Email and Anti-Spam in 2004, Wittel and Wu presented a paper in which they showed that the passive addition of random words to spam was ineffective against CRM114, but effective against SpamBayes with 100 words added per spam.They also showed that a smarter passive attack, adding common English words, was still ineffective against CRM114, but was even more effective against SpamBayes.