Open Source C Email Clients

Claws Mail is a GTK+ based, lightweight, and fast e-mail client and newsreader. Supports POP3, APOP, IMAP, SMTP, SMTP AUTH, NNTP, LDAP, multiple accounts, spell-checking, addressbook, SSL, GPG, filtering, i18n, & more. It is further extended by plugins.

Note! Code and issues are maintained at https://github.com/sba1/simplemail. SimpleMail is a simple to use but powerful mail client. It supports the SMTP, POP3 and IMAP (in a simple form) protocols. Furthermore, among much other features, it is capable of showing HTML mails and can identify spam mails by using a Bayesian filter.

The venerable MH message handling system: a command-line based mail user agent for UNIX/Linux developed at the RAND Corporation and the University of California, Irvine.

SimpleCheck is a fast, low resource, server oriented, Windows System Tray based E-Mail Notification Client with a simple UI that regularly checks multiple POP3 E-Mail accounts. Many full client features; immune to viruses; use to delete SPAM mail.

The continuation of the Alpine email client from University of Washington.

Spruce is an X11 mail client written with the Gtk+ widget set. It is geared towards being extremely small and fast, supporting all the common features that users want or need without sacrificing usability or functionality

OpenChange is a portable Open Source implementation of Microsoft Exchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or Microsoft Exchange servers. OpenChange client-side library is used in existing messaging clients and is the solution in new projects to communicate natively with Microsoft Exchange and Exchange-compatible servers. OpenChange server is a transparent Microsoft Exchange server replacement using native Exchange protocols and does not require any plugin installation in Outlook.

RFC 2425 defines a MIME Content-Type for Directory Information. This library contains necessary methods to parse information blocks arranged in such a manner.

Heirloom mailx (formerly known as "nail") is intended provide the functionality of the POSIX mailx command with additional support for MIME messages, IMAP (including caching), POP3, SMTP, S/MIME, message threading/sorting, scoring, and filtering.

A little mail agent that can check if you have Mail waiting to be read on the server. He have lot of option like exclude mails with something in the subject, multiple accounts, ... It's a GTK+-2.0 based GUI.

YAM (short for Yet Another Mailer) is a commonly used MIME-compliant Internet mailer written for AmigaOS computers. It supports POP3, SMTP, TLSv1/SSLv3, multiple users, PGP, hierarchical folders, filters, a configurable GUI, an ARexx interface and more...

Elmo is a feature-rich console mail client for UN*X power users. It integrates functionality commonly realised by separate pieces of software in other mailers.

Pluto is an email and newsgroup reader for the RISC OS operating system (see https://www.riscosopen.org/), developed by Jonathan Duddington from 1997 to 2004. It stores emails and news articles in Boxes, and they can be Listed, Viewed, Written, Spell checked, Replied to, Searched and even Spoken out loud! After Pluto was released under GPLv3 here on SourceForge in 2013, it has had many improvements. Pluto runs on any version of RISC OS later than v3.10, including RISC OS 5 computers such as the Raspberry Pi, BeagleBoard, IGEPv5, Iyonix, PandaBoard, Wandboard, PineA64 and Titanium as well as the older Risc PC and Archimedes series. From v3.16 onwards the RISC OS version of eSpeak is not included in the Pluto download, but separately in the Files espeak directory. The espeak project itself is on https://espeak.sourceforge.net/ but seems currently dormant. For full details of all updates since v3.06b, please see the Pluto Web Site on http://www.avisoft.f9.co.uk/pluto/

Webmail client for call center agents. Designed to efficiently manage and report on a large number of emails to a small number of email addresses. Specifically designed with webforms in mind where one email address may receive over 1000 emails per day.

After one year without development of the XForms based Unix email client XFMail, the coding has started again. The GTK is supposed to be the toolkit of choice and so we will take XFMail's core, restructure it, and port it to the Gimp ToolKit.

AUC for Education is an GPLed intranet system designed for use in a K-12 setting that provides a web-based environment for students and teachers to interact via "Interactive Classrooms" and other innovative features.

CSCMail is an X/Gtk based MUA. It supports the POP3 protocal and can also read mailspool files/directories. It supports multiple accounts, filters, GPG, MIME, Spellchecking, HTML Mail (view only) and a host of other features.

This program is a minimal SMTP client that takes an email message body and passes it on to a SMTP server (default is the MTA on the local host). Since it is completely self-supporting, it is especially suitable for use in restricted environments.

Edbrowse is a comprehensive editor, browser, and email client that provides access to the net through a command line interface, appropriate for speech or braille. It also supports scripting, to interact with the net in the background, or in batch mode.

A PHP Webmail, utilizing persistant IMAP connections and XHTML 1.1. Since the name is rather long, the preferred nickname is "d-mail".

Draconis is a suite with several Internet Programs for the ATARI platform. It contains clients and drivers for a sucessful internet access.

elmutt - mutt with elm features

Errors Hippo is a BBS offline-reader with support for the Hippo packet format. It features a messagebase and a (hopefully) easy-to-use interface.