If you have a mail address ending with Comcast.com OR Comcast.net
Then you will not be able to join this site or receive any mail from the site.

This is because YOUR web mail server see's this site a Spam and has blocked all mail to you, as such you will not they the authentication mail, so will not gain access.

There is nothing I can do about this as the issue is your end not here, so if you still wish to join you will need to do so with a different mail address.

Thank you