I set up a new email domain using recipient policy in Exchange. MX and DNS records were also added for the new domain. When I send email from an external mail server to the new domain, I get the following error: 550 550 5.4.1 Relay Access Denied.
We have a 3rd party IT vendor that is supposed to set these things up for us, but they never seem to do it right. They use the Microsoft frontbridge SPAM filter. All our email is routed through the filter. I don't have access to view how filtering is configured, so I can't tell if the filter is blocking the new domain or not.
Is there a way to trace exactly where the email is being blocked? Could this be an issue with the Exchange configuration?