|Why are some domains going to a server that is not their MX records? How to fix incorrectly routed outbound emails?
|If a former Essentials customer has updated their MX records, but not disabled their account, it is possible we are sending to the previously configured destination.
How to check if recipient was previously on proofpoint essentials
- If you have a contact at the company ask if they were previously on Proofpoint Essentials
- Or use a website that keeps track of DNS history
- If they were a customer, they need to make sure their relay or company account is disabled.