Unfortunately, this is because iFastNet gets marked as SPAM by a lot of people, so all of their emails go there now automatically. Also, you get the emails because you use InfinityFree’s hosting service, which is powered by iFastNet. You can mark them as “Not Spam” if you would like.
Alright, I use MyBB for the forums, it sends automated emails (e.g adding someone to a buddy list), in another post about the ad problem at the bottom of my emails it said you could use SMTP to get rid of the ads, how do I do that? It talked about using WordPress to do it, but I don’t use WordPress.