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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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    OpenChange Project

    OpenChange Project

    Microsoft Exchange compatible server and client libraries

    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.
    Downloads: 14 This Week
    Last Update:
    See Project
  • 2
    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: 15 This Week
    Last Update:
    See Project
  • 3
    The continuation of the Alpine email client from University of Washington.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 4
    Downloads: 6 This Week
    Last Update:
    See Project
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    Monitoring, Securing, Optimizing 3rd party scripts

    For developers looking for a solution to monitor, script, and optimize 3rd party scripts

    c/side is crawling many sites to get ahead of new attacks. c/side is the only fully autonomous detection tool for assessing 3rd party scripts. We do not rely purely on threat feed intel or easy to circumvent detections. We also use historical context and AI to review the payload and behavior of scripts.
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  • 5
    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: 3 This Week
    Last Update:
    See Project
  • 6
    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: 4 This Week
    Last Update:
    See Project
  • 7
    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: 3 This Week
    Last Update:
    See Project
  • 8
    ** THIS PROJECT MOVED TO GITHUB ** libEtPan ! is a mail purpose library. It will be used for low-level mail handling : network protocols (IMAP/NNTP/POP3/SMTP over TCP/IP and SSL/TCP/IP, already implemented), local storage (mbox/MH/maildir), message /
    Downloads: 1 This Week
    Last Update:
    See Project
  • 9
    Geedot aims to be a lightweight, fully (and only) HTML 4.01 and CSS compliant and functional web browser for X. It uses the gdtoolkit widget set which is very fast and lightweight - yet also infinitely and easily expandable.
    Downloads: 1 This Week
    Last Update:
    See Project
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  • 10
    oserp - stands for OpenSource Emailer Replaces Pine. First goal - replace pine with an open souce work-alike using perl. Second - add an SQL backend to Mail::Box, and thus to oserp. Third - Port to C++, using GNU MailUtils as the backend.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 11
    NOTE: Development has been aborted. Please see the re-alpine project for a better alternative. oserp - stands for OpenSource Emailer Replaces Pine. First goal - replace pine with an open souce work-alike using perl. Second - add an SQL backend to Mail::Box, and thus to oserp. Third - Port to C++, using GNU MailUtils as the backend.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 12
    data & video-conferencing, one shared whiteboard, send text messages (IM), transfer files(FTP),collaborate in real time,email capablities,Plays and stores dvd,cd and Mp3. Web-based Internet directory,Remote Desktop Share,File sharing program & browser
    Downloads: 1 This Week
    Last Update:
    See Project
  • 13
    plutoemail

    plutoemail

    Email reader for RISC OS operating system.

    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/
    Downloads: 1 This Week
    Last Update:
    See Project
  • 14
    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
  • 15
    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
  • 16
    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
  • 17
    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
  • 18
    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
  • 19
    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
  • 20
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    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:
    See Project
  • 22
    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
  • 23
    elmutt - mutt with elm features
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    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
  • 25
    ExtmailHeaderFixer

    ExtmailHeaderFixer

    A Claws Mail plugin to fix the non-standard mails from Extmail.

    Moved to GitHub: https://github.com/sswv/extmailhf
    Downloads: 0 This Week
    Last Update:
    See Project
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