Using Classic Outlook on Windows for personal email, calendar, and contact management
- At the top of the page, select Settings
> View all Outlook settings. - Select Mail > Forwarding.
- Do one of the following:
- To turn on forwarding, select Start forwarding, enter the forwarding email address and select Save. **Note:**Select the Keep a copy of forwarded messages check box if you want a copy of the original message to remain in your mailbox.
Do this in 3 mail boxes whose emails you want to forward in fourth email.