Default "reply to " in Exchange 2003 always resets to User network logon

Running Exchange 2003 in connection with  SBS2003 and Active Directory.

I am unable as Domain Administrator to set the default primary email to a STMP address other than the User Netword Logon.
i.e.    John Doe network login is Jdoe. If i setup up as the primary it resets back to

If we sent out SMTP mail we are broadcasting userid's which doesn't seem wise.

I am unable to locate anything on the net to tell me why it won't let the sysadm make the changes.

Any ideas and can I actually do this?
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Alan HardistyCo-OwnerCommented:
If you change the default SMTP reply address and don't want it to automatically change back again, untick the check box that says "Automatically Update e-mail addresses based on Recipient Policy" and this will stop the changes you make from being undone all the time.
you need to change the Recipient Policy in Exchange so that the default SMTP address is not  <-- explains how to do it.

So by the look of it you would want

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Alan HardistyCo-OwnerCommented:
The alternative is to change the default Recipient Policy to be and this will give you as the default email address.
The variables that you can use are:
%s : Surname (last name)
%g : Given name (first name)
%i : Middle initial  
%d : Display name
%m : Exchange 2003 alias
For reference:
mcarrcpaAuthor Commented:
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