Your email address contains invalid characters

When attempting to register I had to use an alternate email because it would not accept my email address.

My address is tharius@realmsofdespair.info

I suppose it's tripping over the 4 letter tld?

Cheers and thanks

Registration should never validate email addresses. Send a sign-up email and require the user to click an expiring link in the email. That's the only perfect validation.

Yes, I think I fixed it. Try again.

@Fiendish: That is preliminary validation. Then it sends you a confirmation email.

Just send an email to whatever they enter without validation. The email either goes through or it doesn't. If it doesn't go through then the user did not give a real email address and they won't be able to confirm creation.