It's most likely just a random bot, or else someone has a virus on their machine which read the email address in the webpage (or their contact list if they added you), and sent a random email to you. The fact that it's from "someone" at cs.tri means that it's probably just a spoofed return address.

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Edit: Wait, you essentially sent got messages sent from one account to the other? That really sounds like either you have a virus and it sent one out to your contact list (which included the wed_g address) or someone simply added you and it got spoofed that way, by reading one email address and spoofing as another contact. I doubt it was intentional, bah. I'll see if there's any recent threats..

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Edit 2: Hah, there's a new DOS virus for some reason. Anyway, can you remember the subject line of the email at all? (It might be still in your trash, if you forgot)