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
Email client based on the Eclipse RCP platform.
Email client designed to be reliable, and easy to use. All email is kept in a SQL database. Currently supports POP3 and SMTP. The POP3/SMTP access is all performed in a separate process so that it doesn't cause delays in the UI. The Server process may be left running and fetching email, so when the UI starts, it always has the latest messages. It always displays both the HTML and Plain Text versions of a message, there are multiple ways to control which one is onscreen first. (by folder, by sender, by default) Many features designed to make reading Mailing Lists easier. (Wizard filter creator for instance) Tags on msgs can be used to control font/color of each individual field (Subject, From, etc...) as well as performing actions when the tag is applied or removed. (Spam/Fishy mail is handled this way.) Folders may be renamed or moved at any time without breaking filters.
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.
An extremely configurable portable GUI email and news client for Windows/Unix (including OS X) with IMAP, POP3, SMTP, and NNTP support, SSL, flexible address database, Python scripting, powerful filtering, and many other features for advanced users.
Simple Lotus Notes mail client
LNMail is a graphical user interface to access your Lotus Notes mail messages. It is mainly intended to organize the messages stored on the Lotus Notes server. Since by default the space of your Lotus Notes mail account is limited, LNMail gives you easy and seamless access to your created archives. Organization and finding mails should now be easy.
With Tiger Envelopes you can stop snoops from reading your email. Same email client. No extra steps. One click to install on Windows and Linux. Configures Outlook, Thunderbird, and KMail. Supports GPG, PGP, Bouncy Castle encryption.
Kiltdown is an Email Client for UNIX. It is UI independant (I use both Gnome and KDE), and is fully featured, including MIME support, multiple accounts, filtering, etc. It currently runs under Linux, FreeBSD, and Solaris.
QNewsletterCreator is a program to manage your newsletters and recipients thereof. Since it is written with Qt, it is platform independent. The newsletter can consist of both html or plain-text and have attachments as well.
Is an ASP.NET webmail application written in C#. It uses a POP3 or IMAP servers as the mailstore and sends mail through a SMTP server. You can compose HTML messages, search your inbox, read complex mime messages and much more. .NET and Mono compatible.
PHP functions and classes to add a Domain Key Identified Mail (DKIM RFC 4871) signatures to emails sent by PHP. It is based on the openssl extensions of PHP. It can generate DKIM signature but cannot verify them. Developped and tested on PHP 4.0.
A PHP Webmail, utilizing persistant IMAP connections and XHTML 1.1. Since the name is rather long, the preferred nickname is "d-mail".
Open-Xchange collaboration suite. Visit http://www.open-xchange.com/header/community_area.html to get more information about getting support and reporting bugs.
Spamato is a spam filter system that combines several anti-spam techniques, from which thousands of users benefit. It is available as an add-on for Thunderbird and Outlook, and as a stand-alone proxy for other email clients. IMAP and POP are supported.
Open Enterprise is a very ambitious project that comprise some full opensource components to provide a strong alternative to the existing commercial software. Open Enterprise is cross-platform: Windows / MacOSX / Linux / BSD / Solaris / Unix.
Veldfire is a frontend to the Riverdrums C library, and is aimed at simplifying email functionality. The project provides interfaces to sending email, attaching files and sending mail to lists.
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.
TiM is an email client written in PHP with a MySQL backend for storing mail. It can currently retrieve messages from POP3 accounts. Files released on project homepage.
Daffodil Organizer is an e-mail client with the facility to import mails from the Microsoft Outlook's .pst files. In Daffodil Organizer mails are stored in RDBMS that provides maximum flexibility to organize your mails. You can also categorise your mail
The ENMCommander is a Perl Tk Email Client which use pop3 and smtp protocoll. Example Features are different mailfolder, all kinds of mime attachements,.. Because of using Perl Tk it is possible to run the same Email Client on Linux, Windows and other.
GatorMail is a servlet-based Webmail built on the Struts framework. Efficient interaction with the mail store along with a low support overhead are the main goals of the project.
WebMail is a Java Servlet application that gives users WWW access to their IMAP/POP mailboxes. It supports folders, multiple languages, composing messages, MIME and virtual domains.
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.
Thunderbird extension for checking grammar using LanguageTool facilities. NOTE: The project has been moved to GitHub: https://github.com/nuald/thb-gramchecker The old one stays here just for the historical reasons.
Koolwired.Imap is a fully managed .NET IMAP client library written in C#.