I am using centos 5.5 in my machine.I am also using squid3 in that machine.From another computers i am not able to connect pop3 and smtp which users using for mail.
computers listening to port 4880,where squid is running. I changed in browser settings to listen that port in local computers. From outlook i am not able to send or receive mails.
I get a error when i send or receive mail.
Then i tried pinging my mail server i am not able to ping.I also changed safe ports in squid.conf file for pop3 and smtp.

Thanks and Regards