Jun 10, 2008

Mozilla’s spam filter

The German site "Hard Tecs 4U" has reviewed Mozilla's Spam filter and contrasted it with Mailshield. They give Mozilla's Spam filter the thumbs up and find Mozilla's filtering noticeably superior To Mail Shield's*. This is especially interesting since Mail Shield's desktop version costs $60 per license vs. $0 for Mozilla.

Mozilla's Mail fiter was trained with 300 Spam messages and 2700 "good" messages. Then, they let Mozilla automatically analyze 280 new Email messages. Here is a summary of their findings:

  • The analysis of the 2700 "good" training messages took about 1 Minute.
  • The subsequent automatic classification (Spam/not Spam) of the 280 new Email messages took only about 2-3 seconds
  • 107 messages were correctly identified as Spam and moved to the "Spam" folder. Most importantly, not a single "good" message was classified as Spam!
  • The remaining 173 messages were identified as not being Spam and moved to the Inbox. Of those, 30 messages (17 per cent) were Spam but not identified as it.

These results are already very encouraging, especially when considering that Mail Shield's initial error ratio was 50 per cent and even after manual tweaking, it was still at 25 per cent.

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