… if we didn't install roundcube and we use only sogo, we just have to edit version in /etc/iredmail-release without touching anything else?

yes. Updating version number in this file is used to help sysadmin track which iRedMail release is running on the server.

iRedMail-1.5.1 has been released, it contains only one change: update Roundcube webmail to the latest 1.5.2 which addresses one XSS security vulnerability, also fixes few minor issues.

We recommend all users to upgrade Roundcube as soon as possible.

• Download from our website: https://www.iredmail.org/download.html

• Upgrade your existing iRedMail server: https://docs.iredmail.org/iredmail.releases.html

• Release notes of iRedMail-1.5.0: http://www.iredmail.org/forum/topic18626.html

Introduce "iRedMail Easy" - the new deployment, upgrade and support platform

iRedMail Easy is the new web-based deployment, (one-click) upgrade and technical support platform introduced few months ago, we release new version frequently (currently one new release per month), with the one-click upgrade support, you can easily keep the iRedMail server up to date without caring about any technical details. It's the recommend way to deploy NEW iRedMail server and get technical support.

For more details, please check our website, the comparison of iRedMail Easy and classic downloadable installer is available too: https://www.iredmail.org/easy.html

If you need to upgrade existing iRedMail server to the iRedMail Easy platform, please check our tutorial: Migrate from iRedMail to iRedMail Easy platform.

Introduce all-in-one Dockerized iRedMail

We have built an all-in-one Dockerized iRedMail, get it here:
https://hub.docker.com/r/iredmail/mariadb

• Only MariaDB backend is available right now.

• Based on Ubuntu Linux (20.04) docker image, all components in one container.

• SOGo groupware is not yet included.

It's not considered as production ready, please don't run it on production
server now. Feedback, suggestions are all welcome.