Hi Lawrence,
Found this on our support site.
It may or may not help, but worth a shot.
There are several situations which could cause this error message to be displayed. If Anonymous Access setting is disabled in Exchange System Managers Default SMTP Virtual Server properties page, the copier will not be able to send internal or external mail because the mail server will only accept connections from authenticated clients. In this case, the error code indicated at the scanner will be CE-03. It should be possible to leave this setting as-is and still have the copier send mail through the Exchange system, but this would require the addition of an Active Directory user account and Exchange mailbox.
The Relay Restrictions setting (also found in the Default SMTP Virtual Server properties page) allows us to explicitly grant / deny IP addresses permission to send mail through the Exchange system to recipients outside of the local domain. If the copier has been denied permission to relay through this setting (by selection of "All except the list below" and then entry of the copiers IP address) it will still be able to send mail internally - providing it has not been denied this permission in the "Connection control" tab - but requests for transmission of external mail will be rejected by the Exchange system. Again, the error code which will appear at the copier will be CE-03.
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