Exchange Server Share

May 18, 2008

Distribution List Not Getting Mails From Outside – NDR 5.1.1

Filed under: Exchange,Exchange 2007,PowerShell — Amit Tank @ 11:45 am

When you create any distribution list with Exchange Management Console – EMC or Exchange management Shell – EMS in 2007 by default Sender Authentication is Enabled to prevent unwanted messages from spam.

Let’s say I have created a group “Group 11″ in EMC and when I check the Sender Authentication setting through shell it shows enabled.


Get-DistributionGroup “Group 11″ | Select-Object Name, RequireSenderAuthenticationEnabled



Now if you don’t disable it then group doesn’t get any mail from outside of organization and  sender gets NDR 5.1.1 which means Exchange doesn’t authenticate anonymous incoming connection for this group and reject it with this NDR.

So don’t forgot to disable the Sender Authentication after creating any groups in Exchange 2007.


Disable the Sender Authentication

Set-DistributionGroup “Group 11″ -RequireSenderAuthenticationEnabled $False

Verify once it is disabled.

Get-DistributionGroup “Group 11″ | Select-Object Name, RequireSenderAuthenticationEnabled


Hope this helps who are migrated from Exchange 2003 to 2007!!!!


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  1. [...] Distribution List Not Getting Mails From Outside – NDR 5.1.1 [...]

    Pingback by Weekend reading - subject: exchange — May 30, 2008 @ 5:47 pm

  2. I think you should only enable groups to get mail from outside your organization if you have too. Disabling sender authentication for no reason seems like it would open up your organization to spam and other security threats

    Comment by Mekki — June 5, 2008 @ 6:20 am

  3. [...] We recently installed Exchange Server 2007 and noticed that any new distribution lists were not receiving email from any outside addresses. Turns out that this is turned off by default in Exchange Server 2007 and needs to be enabled.  The Exchange Server Share blog has an article describing how to fix this. [...]

    Pingback by Exchange Server 2007: Distribution Lists Not Receiving Email From Outside — August 12, 2008 @ 10:23 pm

  4. This did not fix our problem. We ended up deleting the group we created on Exchange 2007 and recreating them on Exchange 2003. This was the only thing that fixed the problem. We were getting NDR 5.7.1

    Comment by Eric Chatham — September 16, 2008 @ 5:31 pm

  5. How do I do a dynamic distribution list that select the members of a group defined in my Active Directory?

    Comment by Carlos Villalba — November 12, 2008 @ 11:54 am

  6. How long does this take to update? I did this an hour or so ago and I’m still getting User Unknown. :(.

    Comment by Chase Hansen — November 25, 2008 @ 3:23 pm

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