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

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  • 1
    Columba
    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.
    Downloads: 19 This Week
    Last Update:
    See Project
  • 2
    Hastymail
    Hastymail is a fast, secure, rfc-compliant, cross-platform IMAP/SMTP client application written in PHP providing a clean web interface for sending and reading E-mail. This version of Hastymail is no longer being developed. We are now working on a new version, Hastymail 3, AKA, "Cypht". http://cypht.org
    Downloads: 9 This Week
    Last Update:
    See Project
  • 3
    jwSMTP, Send email programmatically (C++ code/lib). Linux, BSD, Windows etc. Attachments, Multiple recipients, Cc/Bcc recipients supported. MX lookup or send to an SMTP server direct. LOGIN and PLAIN authentication now supported. Html or plain text forma
    Downloads: 8 This Week
    Last Update:
    See Project
  • 4
    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: 7 This Week
    Last Update:
    See Project
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    Monitoring, Securing, Optimizing 3rd party scripts

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  • 5
    IMAP-Agent is an automated IMAP mail folder management system implementing site wide and individual user specific rules for filtering mail between folders. Also, quotas can be maintained by age or max count of messages for any folder.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 6
    An IMAP E-mail client for X-Windows written with GTK. Supports IMAP with and without SSL.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 7
    AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 8
    Koolwired.Imap is a fully managed .NET IMAP client library written in C#.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 9
    Cassiopeia's BitMail

    Cassiopeia's BitMail

    Encrypting E-Mail Client

    BitMail is a Proof-of-Concept- / Design-Study for an Qt E-Mail Client. POP3 / IMAP / SMTP / P2P E-Mail-Client. ● Qt E-Mail Client. ● Build-in Encryption to secure E-Mails ● IMAP & POP3 ● Additionally a full decentral P2P Email-Option via the Echo Protocol ● Store Email for Offline-Friends in the P2P Network. ● Chat and Instant Messaging is build in. ● POPTASTIC function (Chat over Email) ● Calendar widget functionality. ● Open Source. BSD License. "Cassiopeia is the tortoise of Momo, which can communicate through writing on her shell and guides into the future." - Wikipedia. Source from: https://sf.net/projects/spot-on/files/ & https://github.com/textbrowser/spot-on
    Downloads: 3 This Week
    Last Update:
    See Project
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  • 10
    Your own mailing system (most easiest to use with zero configuration) for the entire world (available in almost all the languages of the world) which will include Mail User Agent and Mail Transfer Agent thus trying to give maximum speed while transferrin
    Downloads: 3 This Week
    Last Update:
    See Project
  • 11
    the project has moved to <a href=http://aptg2.schattenzauberer.de>http://aptg2.schattenzauberer.de</a> visit the project there
    Downloads: 2 This Week
    Last Update:
    See Project
  • 12
    Blue HttpMail is a library that connects to HTTPMail servers (such as hotmail.com) and a proxy that allows POP3, IMAP and SMTP access to those servers. Blue HttpMail is being developed using the open source library Blue http://bluelib.sourceforge.net
    Downloads: 1 This Week
    Last Update:
    See Project
  • 13
    IMAPWeb is web-based IMAP client. It is written using Java and uses the Enhydra platform. It supports folders, file attachments (sending and viewing), reply, forward (with attachments) and mail delete.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 14
    The Spider Web Network Xoops Module Team provides modules for the Xoops community written in the PHP coding language. We develop mods and or take existing php script and port it into the Xoops format. High quality mods is our goal.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 15
    XCmail is a MIME and multi POP3 server capable mailtool for X11 using the Xclasses layout library. XCmail was designed completely object orientated and by this may be improved easily. <p> XCmail has its own server in the internet. Take a look on it.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 16
    php/MySQL based webmail program. Currently only supports pop3, IMAP is in the works. Has a notebook, a favorites organizer and an addressbook.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    BlueMamba is a powerful, yet simple, open source PHP webmail application released under the GNU General Public License. The BlueMamba Project is going under some reorganization and is changing owners from X6 Industries to Gazood Technologies. Both co
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    CellMate Bot currently allows google queries and aim functions through OSCAR. Made to be used form your cellphone's AIM client, CellMate Bot will be updated to include email, news and map directions in the future. For now, you can use Google SMS.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    A simple command line utility to perform various tasks on a remote POP3 e-mail box. Intended as a replacement for the Email Manipulator utility(mailtool.exe). List and delete messages by size, range, or keyword. Handy for tech support.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    SMTPUTF8 is email programs that can support internationlized email addresses in UTF-8. SMTPUTF8 permits the use of email addresses that include non-ASCII characters such as Chinese, Japanese, and Korean (CJK).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    A web mail service based on J2EE and open source sql database. It supported rules, addressbook, etc..
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    Encki Mail is a web based e-mail system that focusses on ease of use for both the user and the system administrator. The project is being developed for Linux using the popular PHP + MySQL combination.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    A PHP-based web frontend to IMAP mail servers (developed on Cyrus imapd currently). The interface supports reading all kinds of MIME multipart mails, fully managing IMAP folder structures including ACLs and basic mail composition.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    JFoxMail is a opensource J2EE webmail application. Access to read from IMAP account, Compose using SMTP, and Address Book management using LDAP is supported.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Jwapmail is opensource wap (wml) based email client (wapmail) written in PHP using IMAP protocols to communicate with the mailbox server. Jwapmail is compliance to RFC2060 and RFC822. Jwapmail doesn't use php-imap library.
    Downloads: 0 This Week
    Last Update:
    See Project
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