IceWarp Mail Server

IceWarp Mail Server is a business Email and Collaboration server developed by IceWarp Ltd. It features email with custom domain, shared calendars, documents editing, messaging and advanced tool for team collaboration and can be run in Cloud or on a local server using either Windows or Linux,^[1][2] or together with another solution in Hybrid deployment. In 2006 was known as Merak Mail Server.

IceWarp WebClient
Developer(s)	IceWarp Ltd.
Stable release	12.1.1 / October 31, 2018 (2018-10-31)
Operating system	Windows, Linux
Type	Mail Server, Groupware
License	Proprietary
Website	http://www.icewarp.com/

It incorporates groupware capabilities over SyncML protocol, as well as SMTP, IMAP and POP^[3] and can be integrated with other modules, including those for groupware, antispam and antivirus.