Installation and setup procedure to the zimbra mail server:
Zimbra Collaboration Suite (ZCS) is an Open Source, collaborative platform for email servers, developed in two editions, Open Source edition (Free) and Network Edition (Paid).
This blog describes how to install Zimbra Collaboration Suite (ZCS) Open Source Edition on a Cent OS server. For easy understanding, this is my information system.
Domain : assistanz.com
Hostname : zimbra.assistanz.com
IP Address: 192.168.226.231
Gateway : 192.168.226.1
1. Set selinux to the permissive and disable Firewall.
[root@zimbra ~]# vi /etc/selinux/config
SELINUX=permissive
[root@zimbra ~]# service iptables stop
[root@zimbra ~]# chkconfig iptables off
2.Patch the system with latest updates.
[root@zimbra ~]# yum update -y
3.Configure /etc/hosts, /etc/resolv.conf and hostname.
Open the file /etc/hosts and configure as follows:
Open the file /etc/resolv.conf and configure with your DNS nameserver details as below.
Open the file /etc/sysconfig/network to change hostname to the name zimbra.assistanz.com.
4.Disable postfix and sendmail services.
Run the following commands as root.
[root@zimbra ~]# service sendmail stop
[root@zimbra ~]# service postfix stop
[root@zimbra ~]# chkconfig sendmail off
[root@zimbra ~]# chkconfig postfix off
5.Install packages dependencies needed by Zimbra.
yum -y install perl perl-core wget screenw3m elinks openssh-clients openssh-server bind bind-utils unzip nmap sednc sysstat libaio rsync telnet aspell
6.Download ZCS open source edition version 8.7 using the below link.
[root@zimbra ~]# wget https://files.zimbra.com/downloads/8.7.10_GA/zcs-8.7.10_GA_1829.RHEL6_64.20170524161336.tgz
7.Install the zimbra package on server.
[root@zimbra ~]# tar -xvf zcs-8.7.10_GA_1829.RHEL6_64.20170524161336.tgz
Sample installation outputs are given below.
i. It will ask you to install zimbra packages, press Y to install all.
ii. Finally it will start zimbra installation process and main menu will be appear as below. 
iii.Store configuration.
iv. Need to setup the admin password to access zimbra, press 4 to setup the password.
v. Press ‘r’ to return main menu and press a to apply the changes in configuration and to complete the installation.
The zimbra mail server installation has been completed successfully now 🙂
Good luck and hopefully useful 🙂
Installation video here : https://www.youtube.com/watch?v=yVH6U8xmmNU
