Receive notifications of undeliverable emails sent via Networx

If a candidate provides an invalid email address for a referee or the reference request email sent via Networx can't be delivered for whatever reason, the reference request email is sent but we don't receive any notifications that the email was undeliverable (not counting automated out of office replies).

If there was a way of being notified of this, that would be ideal as we only become aware that it was undeliverable if we manually chase an a reference via Outlook and then receive the undeliverable message, slowing the referencing process down.

Thanks,

James