CB

When ajax email check is done and the MX Record doesn't provide a response (mailer rejected it) and off putting warning is displayed. This doesn't stop registration so this warning is just not helpful and drives users away. It should either report success or just report nothing at all (in favor of nothing at all). This will avoid losing users due to confusion in the message. As for example gmail doesn't respond to MX Record lookup and causes this warning.

https://www.joomlapolis.com/forum/153-professional-member-support/229252-registration-ajax-email-checker-failure