How to install iRedMail on CentOS

To install iRedMail on RHEL or CentOS Linux, you need:

  • A FRESH, working RHEL or CentOS system. Supported releases are listed on Download page.
  • 2 GB of memory is recommended for a low traffic production server. Spam/Virus scanning will take most system resource.


Set a fully qualified domain name (FQDN) hostname on your server

No matter your server is a testing machine or production server, it’s strongly recommended to set a fully qualified domain name (FQDN) hostname.

Enter command hostname -f to view the current hostname:

$ hostname -f

On RHEL/CentOS/Scientific Linux, hostname is set in two files:

  • For RHEL/CentOS/Scientific Linux 6, hostname is defined in /etc/sysconfig/network:

For RHEL/CentOS/Scientific Linux 7, hostname is defined in /etc/hostname.
  • /etc/hosts: hostname <=> IP address mapping. Warning: List the FQDN hostname as first item. mx localhost localhost.localdomain

Verify the FQDN hostname. If it wasn’t changed, please reboot server to make it work.

$ hostname -f

Disable SELinux.

iRedMail doesn’t work with SELinux, so please disable it by setting below value in its config file /etc/selinux/config. After server reboot, SELinux will be completely disabled.


If you prefer to let SELinux prints warnings instead of enforcing, you can set below value instead:


Disable it immediately without rebooting your server.

# setenforce 0

Enable yum repositories for installing new packages

  • For CentOS or Scientific Linux, please enable CentOS/Scientific official yum repositories, and DISABLE all third-party yum repositories to avoid package conflict.
  • For Red Hat Enterprise Linux, please enable Red Hat Network to install packages, or create a local yum repository with DVD/CD ISO images.

Since official RHEL/CentOS and EPEL repositories don’t have all required packages with the needed features, iRedMail team has built these packages and made them available trough the iRedMail repository enabled by default at installation time. You can view all available packages here, please check README and ChangeLog files under each directory for more details. Source RPMs (srpm) used by iRedMail team to build the binary packages are available here.

Download the latest release of iRedMail

  • Visit Download page to get the latest stable release of iRedMail.
  • Upload iRedMail to your mail server via ftp or scp or whatever method you can use, login to the server to install iRedMail. We assume you uploaded it to /root/iRedMail-x.y.z.tar.bz2 (replace x.y.z by the real version number).
  • Uncompress iRedMail tarball:
# cd /root/
# tar xjf iRedMail-x.y.z.tar.bz2

Start iRedMail installer

It’s now ready to start iRedMail installer, it will ask you several simple questions, that’s all required to setup a full-featured mail server.

# cd /root/iRedMail-x.y.z/
# bash

Note to Chinese Users

Our domain name has been blocked in mainland China for years (since Jun 04, 2011), please run command below to finish the installation:


Additional variables are:


Screenshots of installation:

  • Welcome and thanks for your use


  • Specify location to store all mailboxes. Default is /var/vmail/.


  • Choose back-end used to store mail accounts. You can manage mail accounts with iRedAdmin, our web-based iRedMail admin panel.


There’s no big difference between available backends, so it’s strongly recommended to choose the one you’re familiar with for easier management and maintenance after installation.


  • If you choose to store mail accounts in OpenLDAP, iRedMail installer will ask to set the LDAP suffix.


To MySQL/MariaDB/PostgreSQL users

If you choose to store mail accounts in MySQL/MariaDB/PostgreSQL, iRedMail installer will generate a random, strong password for you. You can find it in file

  • Add your first mail domain name


  • Set password of admin account of your first mail domain.

Note: This account is an admin account and a mail user. That means you can login to webmail and admin panel (iRedAdmin) with this account, login username is full email address.


  • Choose optional components


After answered above questions, iRedMail installer will ask you to review and confirm to start installation. It will install and configure required packages automatically. Type y or Y and press Enter to start.


Important things you MUST know after installation


The weakest part of a mail server is user’s weak password. Spammers don’t want to hack your server, they just want to send spam from your server. Please ALWAYS ALWAYS ALWAYS force users to use a strong password.