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When I send an email to an email address for someone that has left our company and their account has &nbsp;I receive &nbsp;a NDR when done inside our network. &nbsp;If someone sends an email to a deleted account from outside our network they do not receive a NDR. &nbsp;Is this normal or is there a setting I should change. &nbsp;I am looking for advice.
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When I send an email to an email address for someone that has left our company and their account has  I receive  a NDR when done inside our network.  If someone sends an email to a deleted account from outside our network they do not receive a NDR.  Is this normal or is there a setting I should change.  I am looking for advice.

NDR message for deleted email accounts outside of netwrok

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.