Buddypress and MP2 sign up not sending email

Hi,

I have a dev install that when I signup I get the proper emails. On my live site, it does not. I am going to check with my host to see if there is an issue with php or something, but can you think of anything? Is there an email setting I may have incorrect or a place I could've entered a non @gammahonors.org email that I'm not thinking of?

Thanks!

Kory