I cannot overstate how a _really_ bad idea it is to register your most important asset, your email, on someone else's domain. I wish we techies would teach this to non computer literates, yet I see plenty software engineers doing this very rookie and dangerous mistake.

Get your own domain ASAP.

That literally de-googles, but I could see someone not being inclined to move from one tech giant to another.

Also their server side mail filters aren't very good.