When I played with AWS way back before it became the behemoth it is, I used it to simply store a few small things, like my Keepass DB. I then deleted it.

So my fun fact: if you ever had an account with AWS and delete it, you can never use that same exact email again. So I went from lastname.firstname@gmail.com to lastnamefirstname@gmail.com and have had that AWS account for way longer than the original.

Yeah that’s signing in, so your username must match. There are reasons why you should not use sign in with Google, mostly to do with security and privacy. In which case you can sign up for an account using as many or as few dots as you like.

For just receiving mail this works universally.