If you are that famous or worried about trademark, you shouldn't be using someone else's server. Tom Hanks can just buy e.g tomhanks.actor domain and set up the @me@tomhanks.actor AP actor.

I keep repeating this: the weird part is that we still have all these companies and institutions being okay with depending on someone else's namespace. Having the NYT still announcing their Twitter or Instagram for social media presence is the same as using aol.com for their email.