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Exchange 2019: Enable message copy on Shared Mailbox

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Shared mailboxes in Office 365 and Exchange 2016 or Exchange 2019 are rather common. You may have end users that can "Send on behalf" or "Send As" the mailbox.

A common query that comes up often when a user sends an email is that the Sent Items folder is blank and IT receives a ticket to please fix the issue.

To check if the setting is enabled on a Shared Mailbox, you can run the following command from the Exchange Management Shell:

Get-Mailbox "Shared_Name" | fl *sent*

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You can see in the above output that this setting is not configured on the particular Shared mailbox. To enable it, you can run the following command:

Set-Mailbox "Shared_Name" -MessageCopyForSentAsEnabled $true

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The command should run without an errors and once complete, you can re-run the previous command and the properties will showed as "True" (Enabled).

Give it time to replicate and the end users should now see items in the Sent Folder.