ausgold,
What happened to you is called e-mail spoofing. It's actually very simple to do if a server has PHP with the mail() function enabled. Most e-mail a friend scripts send out e-mails that look like they were coming from one e-mail address, but really it comes from a server.
In all honesty, I wouldn't worry about it. Most services know to actually check the headers which will reveal that the message didn't come from your website if, truly, it didn't.
~ Teli
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