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Unable to remove default domain email address added to shared mailbox / user mailbox as alias / Unable to delete email alias

some of the reasons microsoft doesn't allows us to remove the alias email address with the default domain.

i created a shared mailbox called when i created that it automatically created an email alias as by default. Now i tried to create an additional shared mailbox but cannot do so as the address is used by

When i try to delete the alias from the first mailbox the settings seems to be saved without any error message, but when i reopen the dialog box the alias address still there. when i try to edit the alias from a new alias is created but the original one stays there.

i contacted Microsoft support but no luck. (SR: 616031993661261)

i suggest Microsoft to look into this issue with high priority. i suggest to create random email alias if the email address exist so that you can solve this issue.

Hope to see the changes soon.

Please refer below URL's everyone facing this issue

Thanks and Regards
Mohan Reddy

137 votes
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  • Jake Vanderrol commented  ·   ·  Flag as inappropriate

    I found that if you convert the shared mailbox to a regular user (there is a link in the exchange admin panel for the account) you will find that the email alias you are trying to remove is the account's primary login. Change that login, remove the alias and convert back to a shared mailbox and you're good to go!

  • J.Bunne commented  ·   ·  Flag as inappropriate

    Hello, you have probably found your own solution for this issue by now. But for anyone else having this problem I solved it but using the following command in Powershell:

    #This value for "MicrosoftOnlineServicesID" is the value of the MailBox property "WindowsLiveID"
    #We want to change this to our secondary domain to enable the removal of the default primary domain smtp alias

    Set-Mailbox -MicrosoftOnlineServicesID
    "WARNING: UserPrincipalName "" should be same as WindowsLiveID "", UserPrincipalName should remain as"".

    #Ignore the warning and now we can remove the smtp alias
    Set-Mailbox -EmailAddresses @{remove=""}

    #Confirm the removal by issuing this command
    Get-Recipient | Select Name, EmailAddresses

  • Alain Gouber commented  ·   ·  Flag as inappropriate

    The same goes for us.

    However, the other way around it works. If the address * does already exists, it will not be created in the new mailbox afterwards.

    For now, we use a hidden distribution list, were we first create the not used alias, so that when it is needed, we can create a single address from it.

  • Shawn Hoy commented  ·   ·  Flag as inappropriate

    The issue in my case was that once the shared mailbox was created it assigned the USERID to <name> Once I went in and changed that domain to what I actually wanted it to be the changes seemed to stick.

    Note that it still took a good five minutes after removing/saving that it accurately reflected the change.

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