We have been auditing legacy user accounts to begin a mapping to Zendesk, and Zendesk allows mapping to ‘organizations’ via email domain. For some of these leg

We have been auditing legacy user accounts to begin a mapping to Zendesk, and Zendesk allows mapping to ‘organizations’ via email domain. For some of these legacy accounts, the registered email addresses may have typos. So, even a basic DNS check against the existence of the domain’s MX record is helpful. Any of the ‘suspect’ email addresses can then be further evaluated by a human, and then removed or fixed.