I used to do this, now I use icloud and the 'hide my email' tool and it works without any hassle. Even asks me when signing up for something if I want to hide my email. It is easier than adding it to my old setup. Even easier than when I was using my free Google for Business setup.

The rest of apple's email landscape sucks. It is pretty poor at managing spam, the client is terrible, it doesn't sync rules between the desktop app, icloud email, and iphone.

I hate email in general. It is getting to be 1 in a 100 type scenario of anything of value and likely worse if I knew all the emails that were deleted before I saw them.