We recently had a new Firewall / Router installed by a third party company who mishandled the project and was fired. Now we are left to clean up their mess. The last of the issues to be cleaned up is:
A small portion of outgoing (SMTP) email traffic is being rejected by the the recipient. The delivery failure message references our router's internal IP Address (as opposed to our external IP Address of our DNS Host), as well as the Computer Name of the sender.
Any help on the matter would be great, as we cannot figure this out. Thanks1