Configure your Gmail in Outlook

1. Login  to your gmail and got to settings.
2. Under 'Forwarding and POP/IMAP', enable both POP3 and IMAP.
3. Now open your Outlook.
4. Add new account and put all the required information.
5. Put your incoming mail server as pop.gmail.com
6. Put your outgoing mail server as smtp.gmail.com
7. Click on the 'More Settings' as you need to enable few things.
8. At the 'Outgoing Server' tab, tick on "My outgoing server" and "use the same settings as my incoming mail server"
9. Then go to 'Advance' tab, Put the incoming server port as 995 and outgoing server as 465 with SSL connection. 
10. Save and try your connection. It should works! :)