HTML image only spam and OCR

Ken A ka at
Fri Mar 10 23:05:48 GMT 2006

Why not use a checksum of the image attached, assuming the spammers 
don't customize images for each recipient, you should be able to use 
DCC, razor, pyzor type approach to block these if you just look at the 
.gif attachments separate from the bayes poison. You'd probably FP on 
some commonly used 'stationary' if you aren't careful though. The 
MailScanner custom scanner interface is an ideal place to plug in such a 


shuttlebox wrote:
> On 3/9/06, Ian <cobalt-users1 at> wrote:
>> Hi,
>> After reading this bit I had though about maybe using ocr when these types of messages are
>> found.
>> A (not-so) quick experiment using netpbm and gocr on a linux machine here produces some
>> ASCII output from one of these gif images.
>> The question is:  how can I get MailScanner / SpamAssassin to use this method?
>> The command line I am using is:
>> giftopnm test.gif | gocr -
>> which then produces the text on stdout.
>> Thoughts anyone?
> MS supports both a custom spam scanner and a generic virus scanner.
> Look in MailScanner.conf for more info.
> --
> /peter

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