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Mahogany is an OpenSource (free!) cross-platform mail and news client. It is available for X11/Unix and MS Win32 platforms, supporting a wide range of protocols and standards, including SMTP, POP3, IMAP, NNTP (including SSL support for all of them) and full MIME support.

After two and a half years, the new release of Mahogany has been made - still alive!
See the roadmap for a more up-to-date plan for Mahogany.

Features

o Full support for SMTP, POP3, IMAP, NNTP and several different mail folder file formats (including MBOX, MBX and MH).
o Support for multiple mail folders and servers, possibility to check many incoming mail folders.
o Full MIME support, MIME editing in composition window, support for external viewers. Support for inline display of graphics in mail viewer, no external viewer needed. Support for clickable URLs. Nicely formatted printing of messages.
o Sorting and threading of messages including support for server-side sorting and threading for IMAP servers
o Optional HTML viewing.
o Support for fax receiving via EFax.com.
o Support for X-Faces and user-defined message headers.
o Embedded python interpreter for powerful scripting with full object-oriented access to Mahogany's internal structures and classes.
o Powerful complete address and contact management database, including optional auto-collection of addresses from emails.
o Extensive configurability, optionally different configurations for different mail folders.
o Full internationalisation support, Mahogany can speak your language.
o User-friendly GUI, Unix version based on GTK.
o Full support for emacs BBDB email address databases.
o Tree-based hierarchical folder management in main window.
o Context sensitive, HTML based help system.
o Secure communications for all protocols over SSL and/or TLS.
o Easy to use and powerful filtering options.
o PalmOS handheld mail sending and synchronisation.
o Message templates for fully configurable replies and easy message editing.
o Extensive search options (by author, subject, full text, etc).
o Support for Fax mailers.
o Dialup network management.

Under development

o GPG/PGP encryption support.
o Multi-threaded folder access to avoid lock-ups during message retrieval.
o Drag and Drop interaction with Midnight Commander (GNOME file manager) and KDE's kfm
o User-friendly newsgroup and IMAP subscription management.
o Full PalmOS addressbook synchronisation.

The most complete list of features can be found in the Online Manual. Even more documentation in different formats, including the full internal class documentation can be found in the documentation directory..

Homepage: Mahogany
Download: SourceForge

Mahogany 0.67 was released on August 1, 2006
The main new feature is the integration of DSPAM spam filter but many other improvements have been made as well.
Read the announcement text here.

Most important changes are:

• New integrated statistical spam filter (DSPAM)
• Better support for sharing preferences between multiple installations
• Unix port now uses GTK+ 2 toolkit
• Folders can now be dragged in the folder tree to reorder them
• Select the viewer best suited for the contents of the current message
• Highlight options with non default values in the preferences dialog
• New nop() (stop filter processing) filter action added
• The "Set From from To" option is now more useful
• Use clear text when replying to PGP-encrypted messages
• New ``Where is filter'' command
• Warning if you start replying to the same message a second time
• Detect forgotten attachments before sending the message
• Innumerable bug fixes

Please see the CHANGES file in the distribution for more detailed list of changes.

The latest official release is available from SourceForge.