Sending *to* my domain from GMail, I get:
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1 <Daniel@mydomain.com>: Relay access denied (state 14).
We got to the conclusion that "the mx dns entry points to a server that is not recognizing the destination domain as one of [its] own."
So, how do I tell the server that, in fact, that destination *is* one of its own?
If my IP resolves to MyOtherDomain.com but MyDomain.com is also there ... how do I tell the server that both are OK?