Check and see if your mail program will let you see the full headers. Then check the Received lines.
That should enable tracing the source. If he is innocent, he'll be happy to have been informed that he's infected (or he'll be an asshole who won't believe it).
And if the guy (or gal) is an asshole about it (either because it's deliberate or because they're an asshole) you can report them to their ISP.
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Hmmm...with my main email address, I have yet to get a single virus. Odd.
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That should enable tracing the source. If he is innocent, he'll be happy to have been informed that he's infected (or he'll be an asshole who won't believe it).
And if the guy (or gal) is an asshole about it (either because it's deliberate or because they're an asshole) you can report them to their ISP.
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