MDaemon Messaging Server is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best Linux alternative is Google Workspace. It's not free, so if you're looking for a free alternative, you could try mailcow: dockerized or Kopano. If that doesn't suit you, our users have ranked more than 10 alternatives to MDaemon Messaging Server and ten of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to MDaemon Messaging Server are iRedMail (Freemium, Open Source), OpenChange (Free, Open Source), Citadel (Free, Open Source) and Axigen (Paid).
Axigen provides a multi-tenant, fully integrated, multi-platform, all-in-one email, calendaring and collaboration messaging solution.
It grants extensive branding options and is localized in over 29 languages (including right-to-left writing mode).
IceWarp integrates all communication & collaboration features in one unified solution. Available in cloud or for on-premises deployment, IceWarp is a great tool to share and exchange all information and ideas online, offline or via mobile devices.