[ScottBurson]

> emails with a `+` in them are not valid

Wrong: https://en.wikipedia.org/wiki/Email_address#Syntax

(I know this is of little help if your email app doesn't allow them. I just want to point out that the standard does allow them.)

[coldacid]

I think what Mashimo means is that Infoteam.ch thinks that `+` is invalid when it isn't. Sadly they're far from the only ones whose email validation code won't accept the plus character, or many other legal characters in the local part of an email address.