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I am with AT&T Yahoo. I was told, their is away to see if a sent e-mail was opened, that wasn't obbvious to the person who received it. I have e-mailed this person before, and on occasion he says he "never received it". I am trying to get answers to very important questions, and I would like...

I would like to know how to see if an e-mail I have sent somone, has been opened.