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Joined: 20 April 2006
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    Posted: 08 January 2011 at 5:55am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2011 at 10:58pm
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.
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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