I am labbing Exchange 2007 (which I will eventually migrate to a 2010, but thats irrelevant here).
Lets say the internal domain name is fabrikam.net. I do not own fabrikam.net and therefore cant actually get mail on this domain externally. I do own Contoso.com and have set contoso.com as an accepted, authoritative domain in hub transport. I also added a user (we will call him hyper) that has by default the
hyper@fabrikam.net email address as well as I added
hyper@contoso.com as one of his emails.
I added MX records for contoso.com that point to my mail server, and I can telnet into the correct port using that external DNS name.
However, when I send an email as a test, it never arrives in my inbox. I get a message a few days later saying the message was undeliverable.
Did I miss something?