Seems no matter what I do, I cannot stop my msn mail from receiving mail, coming in to my default service provider mail, a (different address)

I want the email programs totally separate, as they once were, for years

If I am expecting mail...coming in to me....addressed to *** @bellaliant.net      how does it end up in my msn.com mail???

there seems to be no where in settings, I can access pop and smtp settings in my msn mail

thanks

mike