Well, I just almost e-mailed a scammer. I had entered a giveaway for a lovely Shell necklace as part of One World, One Heart...and got a message that landed (properly) in my spam mail folder saying "Send your details to firstname.lastname@example.org for your shell won prize." Well, sometimes legit blog giveaway messages get transfered into SPAM so I almost answered it...but then, because that was ALL it said (not anything about the blog...not even in the sig, which is unusual) I decided to look the e-mail up on google and guess what: pages and pages about this guy scamming people. WHEW! That was a near miss!
So, if you get that message, avoid it like the plague. It's not from anyone you entered a contest with.