Hi, I have installed postfix on my vps(centos4.5) .It has plesk that by default installed qmail. So I remove qmail rpm . Now when I telnet to [root@vps111 ~]# telnet 127.0.0.1 25 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. 220 vps111.dom.com ESMTP Postfix ---its OK ifconfig venet0 inet addr:127.0.0.1 venet0:0 inet addr:18.104.22.168 venet0:1 inet addr:22.214.171.124 It does not have any iptable firewall . [root@vps111 ~]# iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination I can connect to the server through ssh . But I can not telnet to 25 port of any of those ip(126.96.36.199/15) from inside or outside. [root@vps111 ~]# telnet 188.8.131.52 25 Trying 184.108.40.206... telnet: connect to address 220.127.116.11: Connection refused [root@vps111 ~]# telnet 18.104.22.168 25 Trying 22.214.171.124... telnet: connect to address 126.96.36.199: Connection refused Also my /etc/hosts file is also rewritten ... by some old value ? Can any one suggest what to do ? Please help me.Thanks.