mailcow is #6 in Top 10 Email Servers
Mailcow is a dockerized, seemingly easy to manage mail server suite.
Positions in ratings
#6 in Top 10 Email Servers
Alternatives
The best alternatives to mailcow are: iRedMail, Zimbra, Postfix, Roundcube
See also:
Top 10 Email Servers
Top 10 Email Servers