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Yes just change the smtp address on mailbox properties
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Yes just change the smtp address on mailbox properties

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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. &nbsp;I need to have it so when someone e-mails the user they get a bounce back/NDR message. &nbsp;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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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?

Exchange 2010 Generate NDR for Disabled User Account

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.