Dear Net Filter Team. Subject : SMTP Nating required? AS we install Squid proxy server on red Hat Linux 9. Squid is working fine on Linux machine and doing his Job good. But on client machine when we configure outlook express With SMTP server as mail.xyz.com and pop3 server as pop.xyz.com It is not resolving that names. It is giving the error. But with Web mail client I can check my mail. How can I resolve this problem..