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:
Due to licensing problems, the ClamAV plugin has been dropped. Users who still wish to scan their incoming mail for viruses are recommended to use a Filtering rule such as ~test "clamscan --quiet %F" to call clamscan directly.