Claws Mail 3.20.0
Claws Mail is a GTK+ based, user-friendly, lightweight, and fast email client derived from Sylpheed. It can manage multiple mail accounts, displays messages in threads, categorized by filtering and colored, has a built-in adressbook. It supports SMTP, POP3, IMAP4, SSL and NNTP. It understands MBOX and MH storage. And it provides GnuPG encryption setup per default. Many extensions plugins (such as for spam filtering) are also available.