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So you're saying that one copy of the email is received by $xoopsConfig['adminmail'] and two copies of the email is received by $thisUser->getVar("email"), making a total of three received email messages?
By the way, XOOPS 1.7.3 is a really old version. I have no idea whether its xoopsMailer class works the same way as the one in XOOPS 2.2.