Kerio Connect is #10 in Top 10 Email Servers

https://www.gfi.com/products-and-solutions/email-and-messaging-solutions/kerio-connect
Kerio Connect
Kerio Connect is a commercial mail and groupware server that runs on Windows, Linux, and Mac OS X. Its features include encrypted access using SSL, anti-virus and anti-spam protection, native over-the-air handheld synchronization, webmail interface, connector for Microsoft Outlook and groupware features.

Positions in ratings


#10 in Top 10 Email Servers

Alternatives


The best alternatives to Kerio Connect are: Zimbra, Microsoft Exchange, Mdaemon, Microsoft 365, IceWarp