I've just migrated to Exchange 5.5 to 2003, and Windows NT to Windows Server 2003.
Yesterday I'd move mailboxes to the new server and now the users that only have email X400, can't send emails.
I've send an email to a X400 email and then I've make a traking and the last step is "SMTP: Non-Delivered Report (NDR) Generated."
In my outlook I receive that can not find the email address.
This user can send emails but can not receive.
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