Postfix Ubuntu Server 14.04 Some users Local Emails Only

Hi, I was wondering if someone has accomplish what im trying to do?

So I have been working with postfix Email server for a while seems to be running great, I wanted to implement that some users can only send to thier domain (internal emails only) but cannot send outside or certain domains but for the sake of it only internal emails I have been trying to follow this guide

So after following this I am able to restrict but only works though squirrel mail but not on outlook which makes no sense

This is my Main.cf

http://pastebin.com/qddCDytS

Here are the pics http://postimg.org/gallery/1us10b3zs/

Thank you