Hello, My server is on Mandrake 10.1 off. eth0 is gateway with static IP connected to 512Kbps DSL. eth1 is LAN. I went to webmin ->networking -> linux firewall. I did a NAT on eth0. Then I added rules using packet filtering for sending and recieving mails as follows : accept if network protocol is TCP and destination port is 110 accept if network protocol is TCP and destination port is 25 saved and applied configuration and rebooted. But I am not able to send or recieve mails on client machines. Why ? Anybody has any idea please help. Thanks Varun