Google apps mail can't send/receive emails within the same domain name

I am using domain name "domain.com" in google apps mail application. I've set all the required google mx records and spf one, i can send/receive emails from everywhere except my own domain name "domain.com". When i send from user@domain.com to user2@domain.com, user2 gets nothing and vice versa. Any suggestions?

http://ift.tt/1dvHQ0Z