Exchange NDR error: 550 5.1.1

Dan used Ask the Experts™
I had a public folder that I deleted yesterday, I first disabled the email address on it,  and then deleted the folder.
I then created a mailbox, with the same email address.

Now when I try to email the new account, I get these errors.  Is there a manual way to update exchange, or what would I need to do to refresh exchange, or remove any of the old pointers to the public folder?

Delivery has failed to these recipients or groups:
The email address you entered couldn't be found. Please check the recipient's email address and try to resend the message.
If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:
Generating server:
Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'
Original message headers:
Received: from ( by ( with Microsoft SMTP Server (TLS) id
 15.0.1156.6; Tue, 14 Nov 2017 08:40:30 -0800
Received: from ([fe80::97d:771a:ed09:476]) by ([fe80::97d:771a:ed09:476%12]) with mapi id
 15.00.1156.000; Tue, 14 Nov 2017 08:40:30 -0800
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Dan Andries <>
To: DonorRelations <>
Subject: test
Thread-Topic: test
Thread-Index: AdNdZ0fAM8YWEoyAT0qN9JJQH0yK6A==
Date: Tue, 14 Nov 2017 08:40:30 -0800
Message-ID: <>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator: <>
MIME-Version: 1.0
X-MS-Exchange-Transport-FromEntityHeader: Hosted
X-Originating-IP: []
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Hemil AquinoNetwork Security Engineer
Distinguished Expert 2018

This issue may occur if the on-premises mail-enabled user who represents the moved mailbox isn't stamped correctly with the target address. The Exchange server generates an NDR message because the on-premises Active Directory Domain Services (AD DS) can't locate the user in order to route the mail correctly.

1- Open the Exchange Management Console on your local Exchange 2010 server.
2- Click Microsoft Exchange On-Premises, and then click Recipients Configuration.
3- Right-click the user, and then click Properties.
4- On the E-mail Addresses tab, click Add, click SMTP Address, and then enter the email address. Use the alias@domain format for the email address.
5- Select the name that you entered, and then click Set as Routing Address.
6- Click OK.
DanNetwork Engineer


I actually have exchange 2013, but no worries, I forgot to mention that. So I did what you said, I believe you wanted to make sure I have checked the checkmark where it updates the emailaddress based on the email policy in place.  

But it's still not working, I keep on getting the bounce back.

Hemil AquinoNetwork Security Engineer
Distinguished Expert 2018

Oh ok, but I need to ask you something before move further into this.
Did you delete the cache of that email in your computer? meaning when you type the email address in outlook then the auto complete list appear, you need to deleted, close outlook and re-enter that user.

Try that and see how it goes.
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DanNetwork Engineer


yes, I did delete the outlook autocomplete cache.
Hemil AquinoNetwork Security Engineer
Distinguished Expert 2018

Did you try using a different machine to send a test email to that specific address. Please do that, because you hint it's just right here

I had a public folder that I deleted yesterday, I first disabled the email address on it,  and then deleted the folder.
I then created a mailbox, with the same email address

That happened to me and it turned out that my machine was holding the cache of my email somehow.
DanNetwork Engineer


yes, I just did a test from a laptop, and I'm getting the same problem.
It's not a problem with my local machine, the problem is with my AD.
My AD is still pointing to the old public folder.
Hemil AquinoNetwork Security Engineer
Distinguished Expert 2018
The error message #550 5.1.1 means the following:

1. The recipient email address was entered wrongly. -- Which I believe you've checked.
2. No such recipient is present in the destination email system.
3. The recipient mailbox has been moved.
4. An invalid legacy domain name exists for the recipient mailbox Active Directory.

I would like to confirm whether you were able to deliver mails to this domain earlier, or received Non-Delivery Report (NDR) in recent times.
If yes, you can contact the recipient and confirm if they have altered or configured their domain or Active Directory settings.

Here is the last method

Warning This procedure requires ADSI Edit. Using ADSI Edit incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems that result from the incorrect use of ADSI Edit can be resolved. Use ADSI Edit at your own risk.

Click Start, click Run, type adsiedit.msc, and then click OK.
Locate and right-click the user, and then click Properties.

Note To determine the container to which the user belongs, view the user properties in the Exchange Management Console.
Click the Attribute Editor tab, and then double-click Target Address.
Type the external Simple Mail Transfer Protocol (SMTP) address.
Click OK.
After the service routing domain is set up, confirm that the issue is resolved.
DanNetwork Engineer


so I know for sure it's not #1 or #2 from your list.  It's either #3 or #4, I know for sure.

So yesterday, the email was a public folder and it was working fine, multiple people internally and externally was able to send emails to it.  The department supervisor did not want a public folder, but wanted that to be a mailbox, so email can be in the mailbox and also be forwarded on to someone else as well.

So I disabled the mail-enabled public folder called donorrelations (which had that email address), and then then deleted the folder.  Then I created a mailbox called
When I did some tests last night, it seemed to work,

I just did an external test and that works, so I can send an email from my account to
But all my internal emails are failing.  This is strange.
Hemil AquinoNetwork Security Engineer
Distinguished Expert 2018

I've found this. I never tried but you might give a shot

Went to the properties of the user.
Navigated to the e-mail address tab.
“Add” a new “Custom Address”
Filled in “type” as “X500″ and edited the massager address from outlook as per below and entred it as the address
Network Engineer
I figured out the problem, here's what I did that worked.  I think the secret was to wait, from the time I performed the update global address list, it takes a few hours it looks like, as I've deleted my local cache and the public folder was still coming up in my global address list.  After a few hours, I did it again and it worked.  So I had to wait.  Here's what I did.

      1. In exchange management shell, run the following command, Get-GlobalAddressList|Update-GlobalAddressList
      2. Then wait about 2-3 hours
      3. Then delete the outlook autocomplete cache on the local machines
      4. Then download the newest GAL in outlook,
            a. Click on send/receive
            b. Click on send/receive groups
            c. Click on Download address books
            d. Uncheck the box "download changes since last send/receive", so it can download the entire GAL, click ok
Hemil AquinoNetwork Security Engineer
Distinguished Expert 2018

That's good man. Keep a log of that.
DanNetwork Engineer


yes, thank you sir... I use onenote, and I added it to my one note !
DanNetwork Engineer


Thanks Hemil for your help.

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