Install iRedmail on a CentOS 6.8 server Rumi, March 17, 2018June 10, 2018 We need to set a FQDN hostname before we set up the mail server. On CentOS Linux, hostname is set in two files: Hostname setting: nano /etc/sysconfig/network # Part of file: /etc/sysconfig/network HOSTNAME=demo.iredmail.org Hostname <=> IP address mapping: /etc/hosts. WARNING: Please list the FQDN hostname as the first item. # Part of… Continue Reading