Works on Red Hat Enterprise Linux, CentOS, Scientific Linux, Debian, Ubuntu, Gentoo, openSUSE, FreeBSD, OpenBSD.
Install iRedMail on:
FAQ for iRedMail Administrators
Usually, upgrading iRedMail is just updating some config files to achieve new features or fix bugs, you do NOT need to download the latest iRedMail and run the script.
Note: Upgrades are only supported from one release to the release immediately following it. Do not skip releases.
Upgrade iRedMail from: