Solution Emailing Open Source. Zimbra offers an open source email platform for the enterprise. The sendmail sentrion platform is specifically designed for large complex environments but we make a subset of that solution available as an open source offering.
Kolab is one of the best free and opensource mail. Easily customize extend and integrate zimbra with line of business applications and organizational workflows. Zentyal is an open source email and groupware solution based on ubuntu and is available for all major unix distributions.
Zimbra is the most popular opensource mail server and used millions of people.
It has many tools which support the kmail to provide optimal solutions. Zimbra email and collaboration suite. Kolab is a free and open source groupware suite. With the tool the user can create and send service emails and email newsletters.
