[ubuntu] It's regarding Squid Proxy (Internet)

Hi

We are using majority ubuntu systems in our premises.

We also use Ubuntu Server for inteet with Squid Proxy. Recently we changed our mail server, because of this we have to give direct inteet for every system. So my conce here is users can open any site because of direct inteet. I checked with our mail providers they told us that through proxy mails will not work.

So how I can assign only for mails (like Thunderbird or any other mail client) full inteet and while browsing inteet should not work without proxy.

Thanks in advance

Lokesh Kamath