MozillaZine

eWeek Rates Mozilla's Bayesian Spam Filtering

Wednesday October 29th, 2003

Yacoubean writes: "eWeek reviewed spam filtering with various tools, including Mozilla 1.5 and Outlook 2003. Their test showed that Bayesian filtering (used in Mozilla) is more effective at fending off spam. Outlook 2003 and other products use the whitelist/blacklist approach, along with proprietary technology. The eWeek tests showed that these techniques flagged a lot of false positives, while Mozilla rarely flagged legitimate email. eWeek also points out, on the down side, that Bayesian filtering requires a lot of initial work from the user to train the filter, however 'the investment can pay off.'"


#3 Spams changing identity

by hillbilly198 <hillbilly1980@green-light.ca>

Thursday October 30th, 2003 11:34 AM

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Spammers are adapting their techniques, notice the jibberish at the top of alot of spam now a days. My (rough) understanding is that mozilla filters work by weighing the value of each word in an e-mail has towards determining if it's spam, by adding 3 lines of jibberish to a spam e-mail the filter gives a lower spam score because it has never seen that "word" and thus gives it the beneifit of the doubt.

An interesting idea I read about was creating filters that process the content of the websites that are linked in the e-mail as well, the e-mail might only say "I was thinking about you when i saw this site" and be left alone by the filter but if mozilla reached out and checked the site it would see the words "viagria", "cheap", and "for sale", adding that score to the original e-mail and the message gets flagged.

Spammers are shifting away from advertising their products in the actual spam message and moving more towards mimmicking legitament e-mail instead, tricking you into clicking the link is their number one main goal, the website is now the first line of salesmenship and is secondary.