I don't really see what's wrong with this. He even said you can remove the code. Besides that it actually is an informative email. He's just giving you a sort of voluntary place to tip?
Seriously? People believe it is not spam if they say you can remove the ref code.
50% of the spamposts on forums contain that sentence, the other 50% camouflages the ref url with
url of the original siteThis is clearly spam not an info mail, the info mail I've allready got from MtGox themselves before I got 8 mails from our nice btc supporter.