Open settings of the mailbox by selecting the settings icon on top-right corner
Click Organize email on the features pane
Then click inbox rules tab
Click down arrow and click create new rule for arriving messages option
You will see a pop up which will let you configure inbox rule. Enter name of the rule. For option, when the message arrives and, choose “Apply to all messages”. Similarly, for option, do the following, choose forward the message to option.
Now click select people. Type the email address where you want the mails to be forwarded. Click OK.