Shared Mailbox Sent Items Not Saving

Question

We have a shared mailbox with multiple users assigned to it. When a user sends an email from the shared mailbox, a copy of the sent email is saved in their personal Sent Items. However, the email does not appear in the Sent Items folder of the shared mailbox.

Answer 1

Hi jujhar singh

As states in this LINK, when a user sends mail from a shared mailbox using delegated access, Exchange/Outlook will typically save the sent copy in the sender’s own Sent Items (their personal mailbox). Unless you explicitly enable the shared-mailbox sent-items copy settings, the shared mailbox’s Sent Items can remain empty even though messages are being sent successfully.

In this context, You can configure the shared mailbox to keep a copy in its own Sent Items using these mailbox properties:

• MessageCopyForSentAsEnabled (covers Send As)
• MessageCopyForSendOnBehalfEnabled (covers Send on Behalf)

Run in Exchange Online PowerShell:

# For messages sent using "Send As"
Set-Mailbox "<SharedMailboxUPNOrAlias>" -MessageCopyForSentAsEnabled $true
# For messages sent using "Send on Behalf"
Set-Mailbox "<SharedMailboxUPNOrAlias>" -MessageCopyForSendOnBehalfEnabled $true

Then verify the configuration:

Get-Mailbox "<SharedMailboxUPNOrAlias>" |
  Format-List MessageCopyForSentAsEnabled,MessageCopyForSendOnBehalfEnabled

Hope my answer will help you.

Best regards

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