Claws Mail http://goo.gl/t8nKR

Claws Mail includes all of the features you'd expect, such as:

Multiple accounts Threaded display Filtering Mime attachments Usenet news reading and posting SSL over POP3, SMTP, IMAP4rev1 and NNTP protocols GnuPG support (with GPGME) User-defined headers Colour labels Multiple MH folder support Mbox import/export External editor Message queueing and drafting Automated mail checking Line-wrapping Clickable URIs Addressbook Printing

The following plugins are included in the source package.

Bogofilter

Enables the scanning of incoming mail received from a POP, IMAP, or LOCAL account using Bogofilter. It can optionally delete mail identified as spam or save it to a designated folder, and also can be used to train Bogofilter.
Bogofilter is available from http://www.bogofilter.org/

Dillo HTML Viewer

Enables the viewing of html messages using the Dillo web browser, version 0.7.0 or newer. It uses Dillo's --local option by default for safe browsing. Dillo is available from http://www.dillo.org

PGP/Core

Handles core PGP functions and is a dependency of both the PGP/Inline and PGP/MIME plugins. Requires GnuPG and GPGME:
http://www.gnupg.org/gpgme.html

PGP/Inline

Handles PGP/Inline signed and/or encrypted mails. You can decrypt mails, verify signatures or sign and encrypt your own mails. Requires GnuPG and GPGME:
http://www.gnupg.org/gpgme.html

PGP/MIME

Handles PGP/MIME signed and/or encrypted mails. You can decrypt mails, verify signatures or sign and encrypt your own mails. Requires GnuPG and GPGME:
http://www.gnupg.org/gpgme.html

S/MIME

Handles S/MIME signed and/or encrypted mails. You can decrypt mails, verify signatures or sign and encrypt your own mails.

SpamAssassin

Enables the scanning of incoming mail received from a POP, IMAP, or LOCAL account using SpamAssassin. It can optionally delete mail identified as spam or save it to a designated folder, and also can be used to train a local Spamassassin (or a remote one if Spamassassin >= 3.1 is installed both locally and remotely).
SpamAssassin is available from http://spamassassin.apache.org/

Trayicon

Places an icon in the system tray that indicates whether you have any new mail. A tooltip also shows the current new, unread and total number of messages, and a contextual menu allows the most common operations.

More...

Additionally, several external plugins are available on the Plugins page. They are not included in Claws Mail to minimize the dependencies and size of the core software, but provide nice, extra functions.

What is it?

Features

Screenshots

FAQ

User manual

 

Downloads

Plugins

Themes

Tools

http://goo.gl/t8nKR