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I would double check carefully before you hit the send button that it shows which email you are sending from.
Typical email clients that are handling more than one email address will allow you to select which email account to send out from on that particular email. It's possible that the program keeps switching on it's own (This is Microsoft after all ;p), and you may not have noticed it happening.
I've seen this before when I was using Windows Live Mail on my Win 7 PC, so at least from the description of what is happening, I believe that's most likely exactly what is happening. |