When sending emails from a shared mailbox the sent emails are saved in a users personal Sent Items folder. The steps below show how to change the behaviour of the shared mailbox to save sent emails in the Sent Items folder of the Shared Mailbox
- Log into office 365 Admin portal (https://portal.office.com)
- Click on Admin
- Click on Groups
- Click on Shared Mailboxes
- Select the shared mailbox you wish to change and click on Edit next to Sent Items
- Turn on Copy items sent as this mailbox
- Click Save
