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Non-deliverable notifications by Outside of email system

mutec1 used Ask the Experts™
I will in a company that uses exchange and outlook 2007 as a client.  When a user  is no longer with the company, I will get an undeliverable message.

There are contacts outside of the email system that do not receive back non-deliverable notifications.  

Why does this happen.
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Assistant Vice President\Network Manager
As a common practice many organizations turn off sending NDR's on the exchange server. This helps to eliminate possible email loops and also phishing for valid email addresses.


How can I learn more about email works. In this case how NDR works
Steven CarnahanAssistant Vice President\Network Manager

Here is a wiki about NDR's:   http://en.wikipedia.org/wiki/Bounce_message