Internet suite in Linux

SeaMonkey is a free and open-source Internet suite. It is a web-browser, e-mail and newsgroup client, IRC chat client, and HTML editing. Everything in one application.

SeaMonkey Mail is a traditional e-mail client that includes support for multiple accounts, junk mail detection, message filters, HTML message support, and address books, among other features. It shares code with Mozilla Thunderbird; both Thunderbird and SeaMonkey are built from Mozilla's comm-central source tree.

Official Version 2.49.1 release. Built from the same Extended Support Release (ESR) branch as Firefox 52 ESR and Thunderbird 52.

Linux distributions have their own way of managing packages. Most distributions provide a graphical frontend for this system. Just search for your program, select your desired program and the program manager will automatically download the package.