Anyway of adding Kroger email to the iPhone mail app instead of vpn.Kroger.com?

I’m trying to sign into my Kroger email but I can’t seem to figure out how to do it. Anyone knows?

It’s not a “Kroger” email, the domain is my store’s name. For example @storesname.com

I hate accessing vpn website and just wish it was easier. I need to check my email since I am in management.