For my spam and non-spam, a good indicator is that I very seldom receive
non-spam messages with a .gif image attached (attachments are usually .jpg or
various document types). And if a wanted mail has a .gif attachment it has
much more text than the usual gibberish in the spam messages (because it is
usually just a company logo or similar, and not essential to the message). So
if spambayes can score attachment type and text size it may help.
Regards,
Peter Barker
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