registration does not work - email address not accepted

Hi.

I try to register on JIW-Games in order to play the game but it does not let me and I don't know why, apart from the fact that my email address is not accepted, since it keeps going red.
it's an addres on @rocketmail.com (yahoo address).
Can you tell me why it's not accepted?
Thank you in advance.
Kevin.

I noticed that when I remove one of the characters before the "@", it works.
my address has 14 characters. You seem to accept a maximum of 28 character in all, including the @ and the period (.).
Whenever I enter only 28, the field goes green.
My workaround will be to use a different address, but can you please fix that to let users with longer address register?
Thank you.