New registrations using Hotmail (and a few other providers) have been blocked for various reasons, and apparently so have confirmation E-mails to those addresses. Chris might be able to help you in that regard; I'll mention it to him.
It's a good idea to change your E-mail address on TPM to something else, like a school or company account. If your domain is blocked, then you'll be in a tight spot if/when something like this happens.