That doesn't change the fact that a lot of validators disallow common, everyday things like + tags or even . characters. The only good way to be sure is to make

That doesn't change the fact that a lot of validators disallow common, everyday things like + tags or even . characters. The only good way to be sure is to make sure the address contains an @ SOMEWHERE other than the last character (.+@.+, maybe), and then send a validation e-mail.