Open Source Email Clients

eMail traffic is on the rise. With over 100 man-years of development time behind it and a clean, intuitive interface that makes handling messages a breeze, Hermes Messenger (formerly known as QUALCOMM Eudora) is more than a way to send and receive mail: it's a powerful management tool with features to increase your productivity and enhance your communications. It is the best eMail program for people who get lots of it. If you're not yet one of them, you soon will be. Take control of your eMail before it takes control of you! Hermes provides industrial-strength communication, free of ads and free of cost.

PopTray is a mail notifier written in Delphi for the Windows platform. It sits in your tray notification area and check mail from multiple accounts on a timer interval. Preview, Delete, Rules, Plug-ins and translated into more than 30 languages.

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.

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

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

can send mails without a mail account. preview and manage up to 20 pop3-mailboxes, view only mail headers first. Mail adress scanner to find mailadresses in files. can send mails by using Remailers. Has a Header-Editor.

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.

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

You've Got Mail: An application that sits down in system tray and checks mails as scheduled. It is *NOT* a mail-reader, only an agent that informs about the current status.

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.

Remote Mail is a multi-account Webmail manager. Quick as a webmail, yet powerful like a POP Email client, it lets you access via Web many POP accounts at once. The ideal companion for people who want to quickly read their mail everywhere they are.

php/MySQL based webmail program. Currently only supports pop3, IMAP is in the works. Has a notebook, a favorites organizer and an addressbook.

An IMAP E-mail client for X-Windows written with GTK. Supports IMAP with and without SSL.

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.

B-Client is a Windows DLL that provides internet communications protocols. This C++ DLL supports SMTP, POP, IMAP and NNTP protocols with support for other open internet communication protocols in the future.

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

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

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.

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.

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).

A web mail service based on J2EE and open source sql database. It supported rules, addressbook, etc..

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.

An .NET webmail project ...

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.

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.