Claws Mail is a GTK+ based, lightweight, and fast email client. Almost all commands are accessible with the keyboard. It also has many features such as multiple accounts, POP3/SMTP/IMAP/NNTP support, OpenSSL, GnuPG, and LDAP support, a plugin system, spell checking, filtering, Actions, spam and virus filters, an address book, internationalization, and much more.
License: GNU General Public License v3
Changes:
GnuTLS support has been implemented as an
alternative to OpenSSL. Non-blocking NNTP has been
implemented. A run-time alternative configuration
directory switch has been added. The ability to
attach files in the Templates was added. An
address book duplicate finder was added. Read-only
support for jpegPhoto LDAP field was added. The
Dillo browser plugin now supports address book
based whitelisting for loading remote images. The
Maemo 4.0 (Chinook) build was enabled. A
csv2addressbook.pl script that imports a CSV
formatted address book was added. The address
books of Becky and Thunderbird are currently
supported.