Change server hostname

To change server hostname, please follow our tutorial in iRedMail installation guide directly:

Also, replace old hostname in below configuration files:

Update Postfix config file /etc/postfix/main.cf.
Amavisd config file /etc/amavisd/amavisd.conf or /etc/amavis/conf.d/50-user (Debian/Ubuntu).
/etc/hosts
/var/spool/postfix/etc/hosts
/usr/local/bin/dovecot-quota-warning.sh, required only if you're running iRedMail-0.8.7 or earlier releases.
Re-generate ssl cert and key with script tools/generate_ssl_keys.sh shipped in iRedMail.