shared mailbox

Question

Hi All,

I have a shared mailbox, let’s say smb@contoso.com, and I have granted 3 users Send-On-Behalf-Of permissions using the syntax below. I now want to revoke one user(user3@contoso.com) Send-On-Behalf-Of permission. Could you please guide me with the PowerShell syntax?

Set-Mailbox -Identity "smb@contoso.com" -GrantSendOnBehalfTo @{add="user1@contoso.com","user2@contoso.com","user3@contoso.com"}

Accepted Answer

Hi,@Roger Roger

Thanks for posting your question in the Microsoft Q&A forum.

The command you provided is quite correct, it does assign Send-On-Behalf permissions to shared mailboxes.

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If you want to revoke a user's Send-On-Behalf-Of privileges on a shared mailbox, you need to clear the members in the Send-On-Behalf of the shared mailbox first and then reassign the permissions.

1.Empty the members in Send-On-Behalf of the shared mailbox.

Set-Mailbox -Identity DL  -GrantSendOnBehalfTo $null

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2.Re-add member.

Set-Mailbox -Identity "smb@contoso.com" -GrantSendOnBehalfTo @{add="user1@contoso.com","user2@contoso.com"}

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Note: Microsoft does not display the user's name directly but the GUID for the user's security. you can find out which user it is based on the GUID.

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