To set up a mail forwarding to an external address, go directly to your Microsoft 365 account at the following address: https://outlook.office.com/mail/

Once logged in, click on the little cogwheel at the top right of the page to open your e-mail options.

Set up a redirection to an external address:  

1. Click on Mail
2. Click on Forwarding
3. Check the Activate forwarding box
4. Enter an e-mail address to which to forward your e-mails
5. Press Save

Your e-mails will now be forwarded to the e-mail address you entered.

Note: to keep a copy of forwarded messages on the emlyon mailbox, check the Keep a copy of forwarded messages box.