Messages sent from a shared mailbox aren’t saved to the Sent Items folder of the shared mailbox in Outlook
Problem
Assume that you’re using Microsoft Outlook 2010 or a later version, and you’ve been delegated permission to send email messages as another user or on behalf of another user from a shared mailbox. However, when you send a message as another user or on behalf of the user, the sent message isn’t saved to the Sent Items folder of the shared mailbox. Instead, it’s saved to the Sent Items folder of your mailbox
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