From the first drop-down menu in the "Forwarding" section, select 'Add a Forwarding Address.'
Enter the email address to which you'd like your messages forwarded.
For your security, we'll send a verification to that email address.
Open your forwarding email account, and find the confirmation message from the Google Mail team.
Click the verification link in that email.
Back in your Google Mail account, select the 'Forward a copy of incoming mail to...' option and select your forwarding address from the drop-down menu.
Select the action you'd like your messages to take from the drop-down menu. You can choose to keep Google Mail's copy of the message in your inbox, or you can send it automatically to All Mail or Trash.
Click Save Changes.
You also can set up filters to forward messages that meet specific criteria. You can create 20 filters that forward to other addresses. You can maximize your filtered forwarding by combining filters that send to the same address. Note: While multiple email addresses can be added to the forwarding address drop-down in the Forwarding and POP/IMAP tab, Google Mail can auto-forward mail to only one address at a time. The address that is shown in the drop-down and has '(in use)' next to it, is the address that mail is forwarded to. You can use filters to forward mail to multiple addresses.