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Friday July 2, 2004

I've been very happily using Thunderbird for a couple of months. The trainable spam filtering feature is awesome and a fast learner to boot.

But I've just found a problem that I'm not sure how to handle. I'm hoping someone (hint, hint) will read this post and be knowledgeable enough to enlighten me, because it seems someone has devised a spam trick that defeats the filtering intelligence. I did look through all the available information I could find online. Except the official support forum for Thunderbird/Mozilla because searching there has been disabled.

Mail was sent by a spammer with my email address (the alumni uwaterloo ca one) in all of the Sender, To and CC fields. But the Displayed Names were, of course, not mine. I would have marked this item as Junk if it had been in my Inbox. Since I sometimes send myself things I want to remember for later, I have a folder for those messages and luckily a Message Filter that puts them there.

Which is why this mail item was curious - from the displayed information, it wasn't from me at all. I opened it to try to figure out what I'd messed up when I created the filter. That's when I realized there wasn't anything I could do about this kind of spam. If I marked it as Junk, my real messages to myself would be Junked, too.

So, I thought: maybe I can add to this filter so that it also verifies my display name. But I am not aware of a way to do this and have not been able to find information on the creation of a Message Filter based on any other fields in the header than those in the drop down menu for this feature.

Got hints? Or a pointer to the online resource that can show me this?

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Discussion:

Thunderbird doesn't just look at header patterns, it uses a Bayesian analysis to inspect header, body, the works. Marking those messages as spam won't blacklist all of your mail, and if it does catch a few in its net, you can mark them as "Not Junk" to help it tell the difference.

Posted by: shaver at July 2, 2004 06:56 PM

Thanks. I'll mark them Junk with impunity now.
I'd still like to know how to use the "Customize..." menu item in Filter Tools, though.

Posted by: janice at July 2, 2004 09:54 PM
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