I replaced SquirrelMail with RoundCube Webmail today. Despite the fact that it’s currently in alpha (0.1 is the current release) and I’m using CVS builds, I think it’s probably the best free webmail client out there. Parts of the interface are AJAX’d, which makes for a pleasant user experience. It’s got an amazing interface, obviously inspired by Aqua (They’ve got a “Made On Mac” button on their webpage - usually a good sign). It’s a little rough around the edges, most notably in the setup area- but once you’ve got it up and running, it’s a great experience.
Update: My friend Paul Stamatiou has posted a HOWTO for setting up RoundCube here.
i have intalled :B now im in need of a email servr to use… or one to install on my gentoo system?