Some of our domains are facing issues in sending mail to our domain on our SBS 2003 Server with Exchange 2003 SP1. We get an error message saying " 550 Mailbox Unavailable Errors" on Incoming Mail. I am not able to make out the cause of this issue as both use Outlook Express. Is there anyone who can help me out dealing with this error??? I need to fix it as soon as possible.
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