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Deny Incoming e-mail

We are running Microsoft Exchange 5.5. We had an employee resign almost a year ago. But now we are continually receiving email for this user that has left. Most of the time the e-mails contain a virus that our antivirus program catches. Is there a way to not accept e-mail on this old users account at the Exchange level? As a last resort I could recreate the users account and create a rule to deny. The email originates from none existent e-mail accounts usually.
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If the user's mailbox still exists, you can remove his email address from the mailbox.

If the mailbox does not exist, there's really no way of preventing email for a non-existant person (Willy.Wonka@yourdomain.com) from being accepted by Exchange's SMTP connector.

It will be rejected by Exchange and returned to the sender (at least attempted return), but there's no way of preventing the initial acceptance.
FlagstoneAuthor Commented:
The user's mailbox was deleted and e-mail sent to that user was forwarded to the Admin. as undeliverable and it is those e-mails I am trying to cut down on.
In Exchange 5.5, I don't think there's a way to prevent the NDR reports from being delivered to the Postmaster.  There may be a way to setup a server-side rule in Outlook to automatically delete those types of messages.
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