Exchange 2003 with Multiple domain

By arturo.a.abbido ·
I guess posting in this forum is my last resort, I've done/read at lot of info regarding in this topic but I still wasn't able to host multiple domain in our Exchange 2003 Server.

To make it short these are steps that I did:
1. Register a new domain name.
2. Set A host/MX records from registrar website.
3. add the new domain SMTP to default recipient policy of Exchange server.

I dont know what i miss here i hope somebody here could help me. By the way I was able to send email locally and outside of our network using the new SMTP. But when I test sending from yahoo to this SMTP this what happen:

Sorry, we were unable to deliver your message to the following address.

Remote host said: 550 Requested action not taken: mailbox unavailable [RCPT_TO]

I hope somebody could help I'm so desperate to find solution for this!!

Thank you in advanced

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