troubleshooting Question

I am getting "User unknown in relay recipient table" when sending mail from an outside account to a few internal accounts.

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I am getting the following error "User unknown in relay recipient table" when sending mail from an outside account to a few new accounts in my domain.  The difference in these accounts from the accounts that are working are, the user accounts are in a child domain, they are new to the domain.

I have no issues delivering mail to these accounts within the same exchange org or with another exchange server with an SMTP connector.
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