diff --git a/Servers/Linux/iRedMail.md b/Servers/Linux/iRedMail.md
index 42c05ab..37a6ed5 100644
--- a/Servers/Linux/iRedMail.md
+++ b/Servers/Linux/iRedMail.md
@@ -7,6 +7,18 @@ Self-Hosted Open-Source email server that can be setup in minutes, and is enterp
 ## Overview
 The instructions below are specific to my homelab environment, but can be easily ported depending on your needs.  This guide also assumes you want to operate a PostgreSQL-based iRedMail installation.  You can follow along with the official documentation on [Installation](https://docs.iredmail.org/install.iredmail.on.rhel.html) as well as [DNS Record Configuration](https://docs.iredmail.org/setup.dns.html) if you want more detailed explanations throughout the installation process.
 
+## Configure FQDN
+Ensure the FQDN of the server is correctly set.  You can find the hostname configured in two locations: `/etc/hostname` and `/etc/hosts`.
+
+## 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.
+``` sh
+sudo sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config # (1)
+sudo setenforce 0
+```
+
+1.  If you prefer to let SELinux prints warnings instead of enforcing, you can set this value instead: `SELINUX=permissive`
+
 ## Set Domain and iRedMail Version
 Start by connecting to the server / VM via SSH, then set silent deployment variables below.
 ``` sh