My email, at least on super user is not loger considered valid. It contains 10 letters after which is 1 number, at symbol (@) and gmail.com. It was considered valid before.
Any idea why does it happen?
EDIT: I get the message when I post new question (like this one). However afterwards I did not receive any error when I simply marked checkbox after posting question. The error was reproducable in sense that after rechecking box after error it was reported again. I haven't change the email and it was fetched from database.