To make sure emails sent as another identity is stored in the sent items folder of that identity, you need to configure MessageCopyForSentAsEnabled.
By default, this attribute is not set, but fortunately, there are several ways to configure it.
This article will explain how it’s done.
Configuring MessageCopyForSentAsEnabled Using AD Users & Computers
With Easy365Manager, you can configure this setting from user properties in Active Directory Users and Computers.
Easy365Manager is a snap-in extension to AD Users & Computers that lets you configure Office 365 licenses and mailboxes as an integrated part of your AD user management.
Open up properties of any user, select the Mailbox tab, and click Mailbox Delegation:
To ensure that all emails sent with Send As permissions are stored in the sent items folder of the mailbox, you only need to select the check box:
Click OK twice to apply the new setting.
You can download a free 30-day trial of Easy365Manager here.
Configuring MessageCopyForSentAsEnabled Using PowerShell
Another way to configure this option is to use the PowerShell command-line tool.
Connect to Exchange Online and use the following command to configure the mailbox to store a copy of Send As emails in the sent items folder of the mailbox:
Set-Mailbox firstname.lastname@example.org -MessageCopyForSentAsEnabled $true
Use the MessageCopyForSentAsEnabled setting to control whether to keep a copy of the message in the sent items folder (of the delegated mailbox) or not.
To handle this setting as part of your day-to-day AD management, you can use Easy365Manager.
Easy365Manager consolidates all your AD management and Office 365 administration in the well-known GUI of AD Users & Computers.
Easy365Manager supports many configurations that are only available via PowerShell, thereby saving you and your colleagues tons of time.
With Easy365Manager, you can even get rid of your on-premises Exchange Server, which will save you money and effectively protect you from the many exploits targeting Exchange on-premises.
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