Step1: Open Outlook.
Step2: Choose New Email.
Step3: If you don’t see the From field at the top of your message, choose Options > From.
Step4: 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.
Step5: Choose OK.
Step6: Finish typing your message and then choose Send.