If you are anonymous you should get them. Have you tried removing your e-mail address from Special:Preferences?
How do you do that? I think you can do it at Special:Unsubscribe.
I assume you're guessing Special:Unsubscribe because I couldn't find any documentation on what it does.
Have you clicked Special:Preferences?
Okay, I'll do that
Yeah I guess Wikia messages can become spam. If you still want them, but not in your inbox have any messages that Wikia sends you become spam.