<A href="http://forums.juniper.net/t5/Wireless-LAN/Captive-Portal-registration-page-using-email-verification/td-p/176031" target="test_blank" rel="nofollow noopener noreferrer">http://forums.juniper.net/t5/Wireless-LAN/Captive-Portal-registration-page-using-email-verification/td-p/176031</A>.
Were you ever able to solve this?