Exchange Duplicate DL with same email address

Question

Exchange Duplicate DL with same email address

Russell Ang 21

Hi,

I noticed the is duplicate display name & smtp address for below account. And 1 of them is no longer exist on AD. No matter how i trying to delete is not successfully.

Pls help to advise.

1 answer

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Answer 1

Yuki Sun-MSFT 41,451 Moderator

Hi @Russell Ang ，

Is this only affecting the particular distribution group?
What's the version of your Exchange server? Are you in a hybrid environment?
And do you have any idea about how this duplicate account was created?

Please try running the cmdlet below to see if the the duplicated account can be removed:

Remove-DistributionGroup -Identity <GUID>

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Russell Ang 21 Reputation points

2020-12-31T03:31:38.3+00:00

@Yuki Sun-MSFT

my reply.

Is this only affecting the particular distribution group?
Ans: Yes

What's the version of your Exchange server?
Ans: 2016

Are you in a hybrid environment?
Ans: Yes
And do you have any idea about how this duplicate account was created?
Ans: No idea, as it's check it's created years ago.

Please try running the cmdlet below to see if the the duplicated account can be removed:
Ans: Will try out, as when get-DistributionGroup - identity will show 1 object.
Yuki Sun-MSFT 41,451 Reputation points Moderator

2020-12-31T10:03:58.247+00:00
Hi @Russell Ang ，

Considering that you are in a hybrid setup, have you tried opening an PowerShell connection to Office 365 and run the cmdlet below to see if it can return the group that has the GUID included in the error message?

Get-MsolGroup -ObjectId <GUID>

If yes, you can try running the following command and check if it works:

Remove-MsolGroup -objectid <GUID> -Force

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Russell Ang 21 Reputation points

2020-12-31T12:38:50.03+00:00

@Yuki Sun-MSFT

As the problem lie within exchange server, as O365 doesn't have this duplication DL or smtp.
Yuki Sun-MSFT 41,451 Reputation points Moderator

2021-01-04T06:34:00.663+00:00

Hi @Russell Ang ，

Then let's see how things are going after running "Remove-DistributionGroup -Identity <GUID>". If it works or should any error returned, please feel free to post back.
Yuki Sun-MSFT 41,451 Reputation points Moderator

2021-01-08T00:03:07.887+00:00

Hi @Russell Ang ,
It has been a few days since we've got an update. Just checking in to see if you have had a chance to try the Remove-DistributionGroup cmdlet? Feel free to post back should you would like further assistance on this.

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Exchange Duplicate DL with same email address

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