Mailcow, is a complete Open Source Email server, which we like to point out, has a very active community and updates, news and fixes almost daily.

With Mailcow, you can host your customers’ domain email services in a professional manner.
With MailCow it is possible to offer a safe, reliable and free of spam, virus and phishing service.
The SOGo Groupware Webmail  goes far beyond just sending emails. At the end of our initial work, we offer full support for 7 days for any Mailcow question.