Received: from bigfootinteractive.com ([216.35.62.79]) by mx-bracke.atl.sa.earthlink.net (EarthLink SMTP Server) with SMTP
My first guess would be fake just from the headers. However, if it looks like legit opt-in stuff, then maybe it is.
I suspect (assuming the person really exists) that their email address is similar to yours, and she fat-fingered you address instead of hers when entering the info on their web site.
Then again, there are a whole lot of spammers that think I want property in Costa Rica and that my name is Jose Martinez.
Loren