I called Comcast they told me that basically SE had to fill out this form to get their email address unblocked from their system. Pretty much anyone who has a Comcast email won't get the beta invite because they thought that address was spamming people.

Please have the owner of ffxiv-noreply@square-enix.com log in with this link
http://postmaster.comcast.net/block-removal-request.html