SeaMonkey includes a full featured e-mail client - formerly Mozilla Mail - which supports POP3 and IMAP4 accounts, an HTML Editor - formerly known as Mozilla Composer - and an IRC chat client.
This stability and security update includes six bug fixes, three of which are related to security. As usual, builds are provided for Windows, Linux, Mac OS-X, and contributors supply builds for Solaris 10 and even IBM OS/2. The Windows version is a 13MB download and the Linux (GTK2) one is 14MB.