First, hello everyone. I'm new to this forum, so if I posted this thread in wrong one, i'm sorry. I've change the hostname in the server. old hostname --> oldserver.example.com new hostname --> newserver.example.com 1st - I've modify /etc/hostname 2nd - I've modify /etc/hosts 127.0.0.1 localhost.localdomain localhost 127.0.1.1 newserver.example.com newserver xx.xxx.xx.xx newserver.example.com newserver 3rd - I've run /etc/init.d/hostname.sh stop & etc/init.d/hostname.sh start 4th - test: run hostname --> newserver.example.com run hostname -f -->newserver.example.com I change also the /etc/postfix/main.cf files replacing "mydestination" and and both SSL certificates (IMAP and POP) replacing "CN" value. Every thing seems ok, but every log files are still showing oldserver.example.com. It's necessary reboot the server? Thanks