Original Youtube Video: http://youtu.be/cdui1HJpDI8
Go to gmail.google.com and login.
Click on the gear, and click on settings.
Click on the Forwarding and POP/IMAP tab.
Click on add a forwarding address, and type
it in the popup box. Then click Next,
proceed, and ok.
Using a different tab/window, go to the
email that gmail is forwarding to, and open
the email sent from Google. Copy the
verification code, and paste it into the box in
the first tab/window. Click Verify.
Click “Forward a copy of incoming mail to
(the email) and archive Gmail’s copy”.
Change the last option if needed.