Beta friend invite Problem

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I recently used my first and only Beta invite to invite a friend. He was able to register an account but when he got to the email verification he never received an email, its been about 3 days now and still no email. He uses an email address, not sure if that has anything to do with it. But as of now he can't use the account w/o it being verified and I can't resend the invite cause it says it's been used. Is there anything that can be done?