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I wouldn't rule out Norton as a potential culprit here either. Anything that sticks itself between the client and the server can complicate things. I know you said it just started, but any time Live Update runs it could be updating the AV engine and introducing something that creates a problem.
One thing to consider, you can have Courier automatically save all email attachments outside of the database (see the online FAQ for step by step instructions on setting up a filter to do this). One of the advantages to doing this is that virtually all AV programs will scan files as they are saved, and thus will catch any infected attachments as Courier saves them. Then you can turn off the email scanning which really does interfere with mail downloading in general.
Another thing to think about doing is creating filters to just kill any messages that come with attachments that are common virus carriers - .pif or .scr files for instance. NOBODY sends those kinds of attachments normally, so it's a pretty step to have a filter automatically discard any message containing on of those.
But having said all of that, it's probably something hapening at the ISP.
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