Exchange 2010 Generate NDR for Disabled User Account

I have a user account that I have disabled in Active Directory, however when external users still send e-mail to this account's e-mail address, they do not get a NDR.  I need to have it so when someone e-mails the user they get a bounce back/NDR message.  I would assume if I delete the mailbox this would occur, but I do not want to do that. Is there another way?
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albert_miquelit managerCommented:
Yes just change the smtp address on mailbox properties
Malli BoppeCommented:
Create Transport rule on the exchange server to  send a bounce back message  or create a outlook rule. Use the below link as guide line to create the rule

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