Inquiry
Add a shared mailbox to Office 365 Outlook on the web
Solution
A shared mailbox allows a group of people to monitor and send email from a single email address. When you send a message using the shared mailbox the email appears to be from the shared email address, not from your own address.
Once you've been added to a shared mailbox you need to add the shared mailbox folder.
If you're using Outlook on the web for Education, sign into Office 365 and choose the "Mail" app. Right-click your primary mailbox in the navigation pane and then choose "Add shared folder...” Type the shared email address, and then click "Add".
The shared mailbox folder displays in your folder list. All email sent to the shared email address will show up in this folder.
To send an e-mail using the shared mailbox, click "New". Click the "...", and choose "Show From".
The first-time you use the shared mailbox you will need to type its shared address in manually.
Right-click and remove your own address, and then type and select the shared address. Finish typing your message and click "Send".
From now on when you want to send a message from the shared mailbox it will be available in the "From" drop down list.
Whenever you send a message using the shared mailbox your recipients will only see the shared email address in the message.
Short video here:
https://support.office.com/en-us/article/add-a-shared-mailbox-to-outlook-on-the-web-98b5a90d-4e38-415d-a030-f09a4cd28207