Quote:
Originally Posted by ThrowingTimber
Dont open 'em, sometimes these non-sensical messages are just designed to have mouse over enabled, so basically you move your mouse over them and wham... your ip.. your operating system etc etc are sent to the recipient. 
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and the way that's done is: they have just one single pixel that acts like a cookie and sends itself back to the sender and it's easily hidden on any page/email and barely noticable when it's sent back.