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Thunderbird delivers. Enjoy safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views. Brought to you by Mozilla, Thunderbird makes email better.
User web site:
http://www.mozilla.com/thunderbird
Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.
KMail is the email component of Kontact, the integrated personal information manager of KDE.
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.
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.
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
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also a mail application platform. We have developed a Java API to let you write Java code to process emails that we call the mailet API. A mailet can generate an automatic reply, update a database, prevent spam, build a message archive, or whatever you can imagine. A matcher determines whether your mailet should process an email in the server. The James project hosts the Mailet API, and James provides an implementation of this mail application platform API. [Less]
YahooPOPs! is an application which emulates a POP3 mail server and provides free POP3 access to Yahoo! It does not depend on Yahoo's POP3 mail server. You can use a POP3 mail client of your choice. This application emulates a POP3 server and enables
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popular email clients like Outlook, Netscape, Eudora, Mozilla, and Calypso to download email from Yahoo! accounts. [Less]
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.
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
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downloadable 'contributions'. It is published under the GPL license and while freely available, a small donation is requested. [Less]
AtMail is an open source webmail client written in PHP under the Apache 2.0 license.
The project aim is to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface.
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Features include complete Webmail functionality, Address-book support, Videomail, Ajax interface, Drag'n'drop and more. [Less]