I was on the Mt Gox e-mail list thing, and now I'm receiving spam to my main e-mail address. Any way to stop this?
The only safe thing to do, is generate a new email address for each time you give out your email address.
Various email systems use different ways of doing this, but in general you if your regular email address firstname.lastname@example.org
(some systems use -)
Once you start receiving spam, then at least you know who leaked your address. If you get fed up, just forward
all incoming email to that address to /dev/null.