I've just done "The Perfect Server - Debian Lenny (Debian 5.0) [ISPConfig 2]", and the server is now located in the DC I made a misstake with the hostname / domain name, and now I want to change this remotely. Example old: server1.example.com new: new.name.com (problem is that I now have 2 servers with same hostname & domain name) This is what I'm sure that I need to do (all done over SSH): 1) edit /etc/hosts and change the server1.example.com to new.name.com 2) do a echo new.name.com > /etc/hostname /etc/init.d/hostname.sh start and verify if both are set the same with: hostname hostname -f Now I'm stuck. In the howto on page 4 step 12 How do I change the System mail name from server1.example.com to new.name.com, and how do I configure Postfix for the new TLS. Do I just edit the needed data in: /etc/postfix/main.cf, delete the SSL certificates and re-create the SSL certificates? Also.. Am I missing any other needed files that I need to change? The setup is only a clean install of Lennt done the "The Perfect Server - Debian Lenny (Debian 5.0) [ISPConfig 2]" way. The system is not running ISPconfig at the moment, so I'm okay on this.