- Open Outlook.
- Choose New Email.
- If you don't see the From field at the top of your message, choose Options > From.
- Click From in the message, and change to the shared email address.
- If you don't see your shared email address, choose Other email address and then type in the shared email address.
- Choose OK.
- Finish typing your message and then choose Send.
From now on when you want to send a message from your shared mailbox, the address will be available in your From drop down list.
Whenever you send a message from your shared mailbox, your recipients will only see the shared email address in the message.