Nostalrius Begins - Quality wow vanilla realm (1.12)

Help please!! I've been trying to make an account and every time I click "create account", a message pops up saying, "Please match the requested format" where the email goes. I've entered my email correctly. Can someone please help me? Thanks in advance.

Greetings,

Try to make a new E-mail with Gmail.
And if that dosen't work try to go on other PC and register.

Farewell