mailbox permissions

Glenn Maxwell 12,336 Reputation points
2024-01-04T20:30:50.6+00:00

Hi All

I am using exchange 2016 hybrid environment. we create users in onprem and migrate to online. i have two regular mailboxes lets say user1 and user2. User2 has a Send As/Send on Behalf/Full Access permissions to user1's mailbox.user2 is sending emails as Send on Behalf user1. The sent emails are seen in user2's mailbox.

is it possible that when user2 is sending emails Send of Behalf user1, the sent emails should be in user1's mailbox not in user2's mailbox.Is there any such setting. will the below syntaxes work.

Set-mailbox ******@mydomain.com -MessageCopyForSendOnBehalfEnabled $True 
Set-mailbox ******@mydomain.com -MessageCopyForSentAsEnabled $True  

Microsoft Exchange Online
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Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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Accepted answer
  1. Jarvis Sun-MSFT 10,221 Reputation points Microsoft Vendor
    2024-01-05T06:54:28.3166667+00:00

    Hi @Glenn Maxwell

    In a Microsoft 365 hybrid environment, when a user sends an email on behalf of another user, the sent email is saved in the Sent Items folder of the mailbox of the user who sent the email, not the mailbox of the user on whose behalf the email was sent.

    However, these parameters are used to enable message copy for journaling purposes, not to change the behavior of how sent emails are saved in the mailbox.

    If you want to automatically forward the sent email to the mailbox of the user on whose behalf the email was sent, you can create a transport rule to redirect the message.


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  1. Amit Singh 5,071 Reputation points
    2024-01-08T06:19:44.9533333+00:00

    In Exchange hybrid environments, when a user sends an email on behalf of another user (Send on Behalf), the sent items are typically stored in the sent items of the delegate (user2 in this case), not the owner of the mailbox (user1). This is the default behavior in Exchange.

    Unfortunately, no built-in setting or attribute allows you to change this behavior directly. The MessageCopyForSendOnBehalfEnabled and MessageCopyForSentAsEnabled details control whether a copy of messages sent on behalf of or as another user is saved in the delegate's sent items, not in the owner's sent items.

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