iRedMail is a full-featured mail server solution. It supports few mainstream Linux/BSD distributions:

• CentOS 7, 8
• Debian 10 (recommended), 9
• Ubuntu 18.04, 20.04
• FreeBSD 12.x
• OpenBSD 6.7

More info:

• License: GPL v3
• Authors: Zhang Huangbin (zhb at iredmail.org)
• Check and download the latest stable release from website
• Install iRedMail by following our installation guides strictly: Installation Guides
• Community, bug report, feature requests: online support forum
• We offer paid support services
• Source packages patched or modified for RHEL/CentOS can be found here, other RPM packages are all installed from official yum repository and EPEL.

We recommend to deploy iRedMail server with the iRedMail Easy platform, it offers easy deployment, one-click upgrade, and tech support via the ticket system. Check our website for more details.

There's also an all-in-one Docker edition here: iredmail/dockerized.