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qmail is a modern SMTP server which makes sendmail obsolete, written by Dan Bernstein. Qmail was released under the public domain in november 2007.
Metrics updated 26 Nov 07
Citadel is a highly integrated Groupware Platform with a Web 2.0 enabled Web interface, but also providing SMTP, IMAP, POP3 and GroupDAV access to its content. Citadel offers Versatile email services with very low administration needed. It provides its own implementations of these server protocols: Imap, Pop3, SMTP, ManageSieve, Citadel.
Metrics updated 11 Oct 08
The Apache Java Enterprise Mail Server (a.k.a. Apache James) is a 100% pure Java SMTP and POP3 Mail server and NNTP News server. James is a complete and portable enterprise mail engine solution based on currently available open protocols. James is
Metrics updated 11 Sep 08
Bongo is an easy-to-use mail and calendar system, offering a simple yet powerful user interface. The goal is to make sharing, organisation, and communication simpler, quicker, and more useful.
Metrics updated 12 Oct 08
Kolab is a Groupware Solution for Emails, Appointments, Contacts and more. It supports mixed client environments (Outlook/KDE) because of an open storage format. Any email client speaking standard protocols can be served.
Metrics updated 28 Aug 08
OBM is a groupware, email, LDAP, Windows PDC, CRM, and project management application. It is mainly used as an Exchange or Notes/Domino groupware and mail server replacement, as an LDAP directory, as a Windows PDC, as a contact and customer database
Metrics updated 13 Oct 08
Buni is a community of open source software developers and users dedicated to the research and development of communication and collaboration software. Buni offers Meldware Communications Suite with Mail, a Calendar Server, Webmail, and a Secure Administration System.
Metrics updated 11 Oct 08
XAMS (eXtended Account Management System) is a PHP-based application suite for managing electronic mail accounts on multiple domains in a virtual hosting environment. The XAMS eMail management system primarily consists of a powerful administration
Metrics updated 29 Jul 08
SME Server is a leading distribution for small and medium enterprises. It stands apart from the competition by shipping with most common functionality preconfigured and features a number of popular additional enhancements in the form of
Metrics updated 12 Oct 08
Scalix Community Edition is a product we’ve packaged and made available for free so every organization can try out and use our robust messaging solution. It includes Scalix Collaboration Platform – which serves as the foundation for all our