Anti-Spam SMPT Proxy : The Anti-Spam SMTP Proxy (ASSP) server project is an Open Source, Perl based, platform-independent transparent SMTP proxy server available at SourceForge.net that leverages numerous methodologies and technologies to both rigidly and adaptively identify e-mail spam. ASSP is easy to set up because it requires only minor changes to the configuration of your your Mail Transfer Agent.
Balsa : Balsa has a graphical front end, support for MIME attachments coming and going, directly supports POP3 and IMAP protocols. It has a spell checker and direct support for PGP and GPG for encryption. It has some basic filtering capabilities, and natively supports several e-mail storage protocols. It also has some internationalization support, including Japanese fonts.
It builds on top of these other open source packages: GNOME, libtool, libESMTP, aspell, and gmime. It also can optionally use libgtkhtml for HTML rendering, libkrb5 for GSS, and openldap for LDAP functionality. It can optionally be configured to use gpg-error and gpgme libraries.
Bongo : Bongo is an open source or free software mail and calendar project.
Unlike many other projects doing similar development, Bongo states that it is not attempting to create an "enterprise" solution designed for large businesses, but software more accessible to the needs of small groups of people and individuals.
Citadel : Citadel/UX (typically referred to simply as "Citadel") is a collaboration suite (messaging and groupware) that is descended from the Citadel family of programs which became popular in the 1980s and 1990s as a bulletin board system platform. It is designed to run on open source operating systems such as Linux or BSD. Although it is still being used widely on bulletin board systems, in 1998 the developers began to expand its functionality to a general purpose groupware platform.
Claws Mail : Claws Mail is a free, GTK+-based, open source email and news client. It offers easy configuration and an abundance of features. It stores mail in the MH mailbox format and also the Mbox mailbox format via a plugin. Claws Mail runs on both Unix-like systems such as Linux, BSD, Solaris, and Mac OS X and Windows.
DSPAM : DSPAM is a free software statistical spam filter written by Jonathan A. Zdziarski, author of the book Ending Spam (ISBN 1593270526) and other books. It is intended to be a scalable, content-based spam filter for large multi-user systems. DSPAM is distributed under the terms of the GNU General Public License.
Dada Mail : Dada Mail is a web-based electronic mailing list management system that can be used for announcement lists. It can also be used to create and manage discussion lists, if you activate and configure an included plug-in called Dada Bridge, for which you will need to set a cron task.Dada Mail is free software distributed under the terms of the GNU General Public License and written in Perl.
Enigmail : Enigmail provides public key e-mail encryption. It is an extension for versions of the Mozilla Application Suite, SeaMonkey internet suite and Mozilla Thunderbird running on Microsoft Windows or Unix-like operating systems. Actual cryptographic functionality is handled by GNU Privacy Guard.Both Enigmail and GNU Privacy Guard are free open-source software.
Evolution : Evolution or Novell Evolution (formerly Ximian Evolution, prior to Novell's 2003 acquisition of Ximian) is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail, calendar, address book, and task list management functions. It has been an official part of GNOME since version 2.8 in September 2004. Evolution development is sponsored primarily by Novell.Licensed under the terms of the GNU General Public License, Evolution is Free software.
Exim : Exim is a mail transfer agent (MTA) used on Unix-like operating systems. It is freely available under the GNU GPL and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail.
Fetchmail : fetchmail is an open-source software utility for POSIX-compliant operating systems which is used to retrieve e-mail from a remote POP3, IMAP, ETRN or ODMR mail server to the user's local system. It was developed from the popclient program, written by Carl Harris.Its chief significance is perhaps that its author, Eric S. Raymond, used it as a model to discuss his theories of open source software development in a widely-read and influential essay on software development methodologies, The Cathedral and the Bazaar.
FreePOPs : FreePOPs is an extensible mail proxy. Its primary use is to allow checking and downloading of e-mail from webmails from any conventional POP3 client program, avoiding the need to use a Web browser. It can also be used as an aggregator for RSS feeds and more.
This application retrieves all your messages from various accounts (e.g. Gmail, Yahoo! Mail, Hotmail, AOL …) without manual login through an http page.
GNU Mailman : GNU Mailman is a computer software application from the GNU project for managing electronic mailing lists.Mailman is coded primarily in Python and currently maintained by Barry Warsaw. Mailman is free software, distributed under the GNU General Public License.
GNU Mail : GNUMail is a free, open source, cross-platform mail client for GNUstep and Cocoa. It is the official Mail Client of GNUstep and is also used in Étoilé. It was inspired by NeXTMail (NeXT's Mail.app), the prime father of Apple Mail. GNUMail is based on the mail handling framework Pantomime.
Getmail : Getmail is a simple mail retrieval agent intended as a replacement for fetchmail, implemented in Python. It can retrieve mail from POP3, IMAP4 and Standard Dial-up POP3 Service servers, with or without SSL. It supports simple and domain (multidrop) mailboxes, mail filtering via any arbitrary program, and supports a wide variety of mail destination types, including mboxrd, maildir, and external arbitrary mail delivery agents. Unlike fetchmail, getmail's Python foundation makes it all but immune to buffer overflow security holes. It also has a simpler configuration syntax than fetchmail.Getmail is free software and is licensed under the GNU General Public License version 2. It is written and maintained by Charles Cazabon.
Gnus : Gnus is a message reader running under GNU Emacs and XEmacs. It supports reading and composing both news and e-mail.Gnus blurs the distinction between news and e-mail, treating them both as "articles" that come from different sources. News articles are kept separate by group, and e-mail can be split into arbitrary groups, similar to folders in other mail readers. In addition, Gnus is able to use a number of web-based sources as inputs for its groups.
Note that, as with GNU, the g in Gnus is always pronounced.
GNUzilla : Gnuzilla, or GNUzilla, is a derivation of the Mozilla Application Suite created by the GNU Project as an attempt to be entirely free software. The reasons being that while the Mozilla project produces free and open software, the binaries released included additional non-free software in the form of Talkback, a crash reporter. In addition, non-free software is also distributed as plugins. Despite this fork, the Gnuzilla and Mozilla projects will continue to synchronize with upstream releases in the future and keeps the triple-licensing to facilitate the reuse of code.
Hula : Hula was an open source mail and calendar project based on open standards announced on February 15, 2005 by Novell.It comes with a web-based client to access information, but desktop applications are readily supported. Novell Evolution released with Hula support in version 2.6, and other clients are expected to support Hula closer to Hula's release.
Hypermail : Hypermail is a free program for creating email archives, in the form of cross-referenced HTML documents. It takes a file in Unix mbox format and generates an HTML archive, complete with an index and various sorting options. It is commonly used for creating mailing list archives, but it can archive any collection of emails. It was originally written in Common Lisp, but was rewritten in C by Kevin Hughes for its initial public release in 1994.
IMP : The Internet Messaging Program or IMP is a popular[citation needed] open source PHP-based webmail client for IMAP. IMP is a component of the Horde project.It is included with cPanel and Plesk installations as a webmail client. It often integrates email, calendar, address book, notes, tasks, filters and a newsreader with cPanel.
Libremail : Libremail is a free software suite for electronic mail (Email) processing.
Developed by Bernard Chardonneau (France), the Libremail suite is diffused under a free software licence, shorter and less juridical than the GPL. This licence insists on the need for diffusing the sources of the programs (instead of the compiled programs) and on the possibility to translate these programs in other languages.
MH Message Handling system : The MH Message Handling System is a free, open source e-mail client. It is different from almost all other mail reading systems in that, instead of a single program, it is made from several different programs which are designed to work from the command line provided by the shell on Unix-like operating systems. Another difference is that rather than storing multiple messages in a single file, messages each have their own separate file in a special directory. Taken together, these design choices mean that it is very easy and natural to script actions on mail messages using the normal shell scripting tools. A descendant of MH continues to be developed under the name of nmh.
MHonArc : MHonArc is a free e-mail archiving program first released in 1994.
MIMEDefang : MIMEDefang is a GPL licensed framework for filtering e-mail. It uses sendmail's "Milter" API, some C glue code, and some Perl code to let the user write high-performance mail filters in Perl.MIMEDefang can be used to:Block viruses (e.g. using Clamav), Block or tag spam (e.g. using SpamAssassin), Remove HTML mail parts, Add boilerplate disclaimers to outgoing mail, Remove or alter attachments, Replace attachments with URL's, Implement sophisticated access controls.
MailManager : MailManager is a web based e-mail management service to address the problem of inbound email distribution and outbound administration. It automates the distribution of emails and tracks their progress from the moment they arrive till the completion of an enquiry. Technically the system automatically filters, routes and manages inbound emails. Operationally MailManager enables users to save time and process emails efficiently.
MailScanner : MailScanner is an open source e-mail security system for use on Unix e-mail gateways and was first released in 2001. It protects against viruses and spam. It is distributed under the GNU General Public License.
Majordomo : Majordomo is a mailing list manager (MLM) developed by Brent Chapman of Great Circle Associates. It is written in Perl and works in conjunction with sendmail on UNIX and related operating systems.
The Mobility Email : The Mobility Email client is a secure mobile communication solution that runs from virtually any location on a computer, USB stick or iPod. It supports the S/MIME and OpenPGP signing and encryption standards, as well as the forthcoming DSA2 and SHA224 technologies, and is backward compatible with TIGER192. It allows users to lock their passwords, mail and account details with AES256 symmetrical encryption. It has pre-installed support for webmail accounts like Hotmail, Yahoo! and AOL.
Modest : Modest is a free, open source, e-mail client developed by Nokia's maemo project. Small and lightweight, it is intended for use on hardware with "modest" resources, in particular Nokia's N800 and N810 Internet Tablets running Internet Tablet OS 2008. It is based on the lightweight Tinymail e-mail framework.
Movemail is a computer program by the GNU Project that moves mail from a user's mailbox to another file. It is part of GNU Mailutils.A compromising of Movemail was the backbone of the hack described in The Cuckoo's Egg by which Markus Hess broke into the Lawrence Berkeley National Laboratory computer system in 1986.
MOzilla Mail : Mozilla Mail & Newsgroups (also referred to as Mozilla Mail/News or simply Mozilla Mail) is an e-mail and news client that is part of the Mozilla Application Suite.Mozilla Mail & Newsgroups features e.g. support for relevant protocols such as IMAP, POP3 and SMTP, a built-in Bayesian spam filter, support for multiple accounts, etc. The feature set is mostly comparable with that of the stand-alone alternative, Mozilla Thunderbird. This is because the two applications share the same codebase for most things except the user interface.
Mozilla Thunderbird : Mozilla Thunderbird is a free, open source, cross-platform e-mail and news client developed by the Mozilla Foundation. The project strategy is modeled after Mozilla Firefox, a project aimed at creating a web browser. On December 7, 2004, version 1.0 was released, and received over 500,000 downloads in its first three days of release, and 1,000,000 in 10 days.
Mutt : Mutt is a text-based e-mail client for Unix-like systems. It was originally written by Michael Elkins in 1995 and released under the GNU General Public License.
Neomail : NeoMail is a free web-based webmail client that can be installed on any UNIX mail server that is also running a web server. The program was developed by NeoCode Solutions and written in Perl.
Open-Xchange : Open-Xchange Server is a messaging and collaboration solution combining common free software packages, open standards and web services. Open-Xchange Server is available as proprietary software and as a community supported open-source software (GPL 2) package. The company producing Open-Xchange, also named Open-Xchange, is headquartered in Tarrytown, NY, USA, with offices in Germany (Olpe/Nürnberg).
POPFile : POPFile is a free, open source, cross-platform mail filter originally written in Perl by John Graham-Cumming and maintained by a team of volunteers. It uses a naive Bayes classifier to filter mail. This allows the filter to "learn" and classify mail according to the user's preferences. Typically it is used to filter spam mail. It can also be used to sort mail into other user defined "buckets" or categories - for example, the user may define a bucket into which work email is sorted.
PhpGmailDrive : PhpGmailDrive, also known as PGD, is an open source software program written in PHP to share Gmail file attachments on the web. PGD is based on GmailFS, a Gmail attachment file system that uses email subjects for organization.
Phplist : phplist is an open-source mailing list manager. It is written in PHP and uses a MySQL database for storing information.
Qpopper : Qpopper is one of the oldest and most popular server implementation of POP3. As a free and open-source server distributed under BSD style license, it has been a common choice for Internet Service Providers, schools, corporations, and other organizations. It is included in several Linux and Unix distributions.
Retchmail : retchmail is a small MRA written in C with the primary objective of being fast. It currently supports only the POP3 protocol with SSL support. Unlike fetchmail, retchmail lacks many features and isn't particularly robust. However, its unique features include the ability to retrieve from multiple remote mailboxes simultaneously, the policy of retrieving smaller mail before larger ones and the feature of downloading more than one e-mail message simultaneously.retchmail is free software licensed under the GNU LGPL. It is written and maintained by Avery Pennarun and Patrick Patterson.
RoundCube : RoundCube is a web-based IMAP email client written in the PHP programming language. RoundCube's most prominent feature is the pervasive use of Ajax technology to present a more fluid and responsive user interface than that of traditional webmail clients. After about two years of development, the first stable release of RoundCube was announced in early 2008.Released under the GNU General Public License, RoundCube is free software.
Simplemail : SimpleMail is a free, open-source email client first released publicly in April, 2005.
Spicebird : Spicebird is personal information manager based on Mozilla Thunderbird's code developed by an Indian company called Synovel. It provides e-mail, calendaring and instant messaging.
SquirrelMail : SquirrelMail is a web-based email application started by Nathan and Luke Ehresman and written in the PHP scripting language. It can be installed on almost all web servers as long as PHP is present and the web server has access to an IMAP and SMTP server.
Sylpheed : Sylpheed is an open source e-mail and news client licensed under the GPL. It offers easy configuration and an abundance of features. It stores mail in the MH Message Handling System. Sylpheed runs on Unix-like systems such as Linux or BSD as well as on Mac OS X and Windows. It uses GTK+.
Sympa : Sympa is an open source (GNU GPL) mailing list management (MLM) software. Its name is an acronym for Systeme de Multi-Postage Automatique (i.e. Automatic Mailing System in French language, and also means "nice" in french).
Vpopmail : vpopmail is a free GPL software package, to provide an easy way to manage virtual e-mail domains and non /etc/passwd e-mail accounts on your qmail or Postfix mail servers. Originally developed by Inter7 it has become a large open source project with a large community supporting it.
YAM : YAM (short for Yet Another Mailer) is a MIME-compliant e-mail client written for AmigaOS based computers. It supports multi-POP3, APOP, SMTP, TLSv1/SSLv3, multiple users, PGP, unlimited hierarchical folders, filters, a configurable GUI (based on MUI) and an ARexx interface and many other features which are common for Mail User Agents (MUA) today.
YPOPs! : YPOPs! (previously known as YahooPOPs!) is open-source software that provides POP3 and SMTP access to Yahoo! Mail. It is available on the Microsoft Windows, Linux, Solaris and Mac platforms. The project was started by Anuj Seth in 2002 and is now supported by a larger community of developers.
Zarafa : Zarafa is a European open source collaborative software solution developed in Delft, the Netherlands. It provides email storage on the server side and brings its own Ajax-based mail client called WebAccess. All server side components and the WebAccess of Zarafa are published under the AGPL license.
Zimbra : Zimbra Collaboration Suite (ZCS) is a groupware product created by Zimbra, Inc., located in San Mateo, California, USA. The ZCS Web Client is a full-featured collaboration suite that supports email and group calendars using an Ajax web interface that enables tool tips, draggable items, and right-click menus in the UI. Also included are advanced searching capabilities and date relations. Online document authoring, "Zimlet" mashups and a full administration UI are also included. It is written using the Zimbra Ajax Toolkit.
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