True, but it you change the argument from “this will happen” to “this with happen more frequently” then it’s still a very reasonable observation.

Yes, the TLD. Wasn’t really sure if most people would know what a top-level domain is.

I did some testing. The form accepts anything in the format *@*.* so long as each * segment only contains appropriate characters. The domain itself doesn’t need to be real, but the suffix needs to be real.

“a@b.cd” works.