Browse free open source C Email Clients and projects below. Use the toggles on the left to filter open source C Email Clients by OS, license, language, programming language, and project status.

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  • 1
    Claws Mail
    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.
    Downloads: 14 This Week
    Last Update:
    See Project
  • 2
    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.
    Downloads: 7 This Week
    Last Update:
    See Project
  • 3
    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.
    Downloads: 7 This Week
    Last Update:
    See Project
  • 4
    SimpleCheck E-Mail Notification Client
    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.
    Downloads: 3 This Week
    Last Update:
    See Project
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  • 5
    The continuation of the Alpine email client from University of Washington.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 6
    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 7
    Downloads: 3 This Week
    Last Update:
    See Project
  • 8
    This simple mail client is for my BSD-sockets studies only, it should read mail in console and connect to servers using POP3 protocol.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 9
    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
    Downloads: 2 This Week
    Last Update:
    See Project
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  • 10
    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 11
    RFC 2425 defines a MIME Content-Type for Directory Information. This library contains necessary methods to parse information blocks arranged in such a manner.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 12
    IDTrans is developing b2b technologies. The primary aspects of the project are secure transmission libraries, a key server, and a application to demonstrate the use of the libraries.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 13
    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.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 14
    win32 native port of the Mutt mail client
    Downloads: 1 This Week
    Last Update:
    See Project
  • 15
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    Downloads: 0 This Week
    Last Update:
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  • 22
    A PHP Webmail, utilizing persistant IMAP connections and XHTML 1.1. Since the name is rather long, the preferred nickname is "d-mail".
    Downloads: 0 This Week
    Last Update:
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  • 23
    Draconis is a suite with several Internet Programs for the ATARI platform. It contains clients and drivers for a sucessful internet access.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    elmutt - mutt with elm features
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    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.
    Downloads: 0 This Week
    Last Update:
    See Project
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