Image filter |
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Shade 
Groupie 
Joined: 20 April 2006 Location: France Status: Offline Points: 45 |
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 Topic: Image filterPosted: 08 January 2011 at 5:55am |
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Dear Roberto,
I have problems with image filter. I explain: If I want to catch some viagra image spam, I need to set spamimagethreshold to 40. But with this parameter, image filter also get a single jpg fractal image (with no text in it) attached with any email I have tested. How this filter work ? It seem not to be very efficienty ? How to block 'image only' spam with few characters to bypass 'Blank email with specified attachment only' ? Thank you for reply. We are receiving lot of spam with image only and subject with "fw:" |
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LogSat
Admin Group 
Joined: 25 January 2005 Location: United States Status: Offline Points: 4104 |
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Posted: 09 January 2011 at 10:58pm |
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Shade,
The image filter performs statistical analysis on the image to see if it "looks like" images embedded in other spam emails. Statistics unfortunately are not always 100% accurate, so this filter will not be able to be as effective as we'd like. We do not recommend to set that threshold higher than 10-15 to avoid too much legitimate spam.
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