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# Install iRedMail on Red Hat Enterprise Linux, CentOS

Attention

It's recommended to use the new iRedMail Easy deployment and support platform to deploy and keep your mail server up to date, technical support is available through the ticket system.

Read more: iRedMail Easy - Meet our new deployment and support platform

## System Requirements

Warning

- iRedMail is designed to be deployed on a FRESH server system, which means your server does NOT have mail related components installed, e.g. MySQL, OpenLDAP, Postfix, Dovecot, Amavisd, etc. iRedMail will install and configure them for you automatically. Otherwise it may override your existing files/configurations although it will backup files before modifying, and it may not be working as expected.

- Many ISPs block port 25 by default, it's used for communication between mail servers, it must be open, otherwise your server may be not able to receive or / and send emails. Please contact your ISP to make sure it's not blocked, or ask them to unblock.

  - Amazon AWS EC2. Request to remove the throttle on port 25.
  - Google Cloud Platform.
  - Microsoft Azure.
  - Linode. Explained in the blog post, you can open a support ticket to request the Linode team to open it.
  - DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.

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

- A FRESH, working RHEL or CentOS system. Supported releases are listed on Download page.
- At least `2 GB` memory is required for a low traffic production mail server, but `4 GB` is strongly recommended to prevent ClamAV eating too much memory for big virus signature database.
- Make sure 3 UID/GID are not used by other user/group: 2000, 2001, 2002.

## Preparations

### 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
    mx.example.com

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

1. `/etc/hostname`:

   `mx.example.com`

2. `/etc/hosts`: hostname <=> IP address mapping. Warning: List the FQDN hostname as first item.

   `127.0.0.1 mx.example.com mx localhost localhost.localdomain`

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

    $ hostname -f
    mx.example.com

### 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.

    SELINUX=disabled

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

    SELINUX=permissive

Disable it immediately without rebooting your server.

    # setenforce 0

### Enable yum repositories for installing new packages

- On CentOS:

  - Enable official yum repositories. On CentOS 8, please make sure repo `AppStream` and `PowerTools` are enabled.
  - Enable repo `epel`.
  - DISABLE all other third-party yum repositories to avoid package conflict.

- On Red Hat Enterprise Linux:

  - Enable Red Hat Network to install packages, or create a local yum repository with DVD/CD ISO images.
  - Enable `epel` repo (you can enable it by installing package `epel-release`)

Attention

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.gz` (replace x.y.z by the real version number).

- Uncompress iRedMail tarball:

    # cd /root/
    # tar zxf iRedMail-x.y.z.tar.gz

## 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 iRedMail.sh

## Screenshots of installation:

- Welcome and thanks for your use

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

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

Note

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 `iRedMail.tips`.

- 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

Warning

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.

- Read file `/root/iRedMail-x.y.z/iRedMail.tips` first, it contains:

  - URLs, usernames and passwords of web-based applications
  - Location of mail service related software configuration files. You can also check this tutorial instead: Locations of configuration and log files of major components.
  - Some other important and sensitive information

- Setup DNS records for your mail server

- How to configure your mail clients
- Locations of configuration and log files of major components
- It's highly recommended to get a SSL cert to avoid annonying warning message in web browser or mail clients when accessing mailbox via HTTPS/IMAPS/POP3/SMTPS. Let's Encrypt offers FREE SSL certificate. We have a document for you to use a SSL certificate.
- If you need to bulk create mail users, check our document for OpenLDAP and MySQL/MariaDB/PostgreSQL.
- If you're running a busy mail server, we have some suggestions for better performance.

## Access webmail and other web applications

After installation successfully completed, you can access web-based programs if you choose to install them. Replace `your_server` below by your real server hostname or IP address.

- Roundcube webmail: https://your_server/mail/
- SOGo Groupware: https://your_server/SOGo
- Web admin panel (iRedAdmin): httpS://your_server/iredadmin/

## Get technical support

- You are welcome to post issues, feedbacks, feature requests, suggestions in our online support forum, it's more responsive than you expected.
- We offer paid professional support service too, check our web site for more details: Get Professional Support from iRedMail Team.