March 29, 2007

Exchange 2003 changing postmaster to

Filed under: Exchange 2003 — wansend @ 7:44 pm

When your active directory domain doesn’t match your email address, you have problems. One of them is that your NDR and delayed mail warnings come from when it should be from The fix can be found in your MMC:

JerrysMMC – Console Root\DOMAIN1 (Exchange)\Recipients\Recipient Policies\Default Policy –> Properties –> E-Mail Addresses (Policy) tab –> SMTP Change to SMTP When you click ok, it will ask you if you want to update all users. I answer No. Answering yes will change all users affected by the policy to the new domain, which can be very bad.

Even if you have other Recipient Policies, the Default Policy determines the source of NDRs.

A Google search for this topic gives unintelligible answers about event sinks or solicits third party software.

NDR = Non DeliveRable email

Lastly, if the email resolves as a secondary address for a user’s account, Exchange will change the email to the primary address for the user – after about a day. This can be a plus if you want to change the NDR from-address to an address other than postmaster. In my case, I had to move the name over to another user so it could be the primary email address.



  1. Great, exactly what I was looking for. Never been font of the eventsink “solutions” and the “masquerade domain” work arround has its downsides to.

    A tip: to prevent all system objects to get the external domain as primary, create a new recpol with the exact settings of the original default policy and give it the lowest priority possible (just before the default). This way the system objects will still only be stamped with the internal domain.


    Comment by Jeroen — June 21, 2007 @ 11:14 am | Reply

  2. I was experiencing the same issue, the domain name did not match the external SMTP address domain. Changing the default recipient policy fixed the auto-generated postmaster address mismatch. I had previously tried changing it in AD Users and Computers and that was of no help.

    Thanks for the tip!!!

    Comment by Trey — June 24, 2008 @ 5:58 pm | Reply

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