Hi I configured a squid server on RHEL4 machine 2.5stable version.eth0 ip is 192.168.0.101 where internet is coming and eth1 is 192.168.1.101 where our lan is 192.168.1.0/24 range.Internet is connected to eth0 and eth1 is connected to lan.When i configured my clients to use proxy internet is working properly.But the problem with the outlook express .Clients using windows2000 prof.Outlookexpress showing a error that your mail server couldnot be found If any have solution for this please send me to rinovincent@xxxxxxxxxx Please its an urgent matter Thanks Rino Vincent Mumbai