Litepost is a simple, lightweight email system strives to provide webmail without all the unnecessary bells and whistles of other webmail services.
If you really want to subscribe to RSS feeds from within your inbox, we hear the new Yahoo! Mail beta has it.
Equipped with the bare minimum email writing, reading, and receiving features, simple yet powerful filtering options (who, what, where, when, and why), tagging, and ratings, Litepost can safely be called “the most web2.0 webmail ever.” Whatever that means.
Litepost is probably never going to catch on as a competitor in the hosted webmail market (Gmail, Yahoo! Mail, etc.), however, the software itself is available as an open source download, that anyone (with the required experience; I tried and failed) can install and use on their own server, with their own email address. Seeing as the current market leader in webmail for web hosts aiming to provide webmail for their clients is SquirrelMail, which frankly is one of the most horrendous services that I’ve ever seen, Litepost has some serious potential.
If you want to sign up for Litepost, with your email hosted on their server, go to mail.litepost.com; the rest of the site has yet to reflect that it is open for registration.
Read (Via Download Squad)

I’m going to try to install it myself, we’ll see. It’s definitely enticing.
If you can do it, please tell me how. I’m desperate! D:
Hello your post is amazing.
I will definitely read your diary..
ciao
Thank god! I don’t know if I can get this working, but if I can, I will post about it.
I am so sick and tired of squirrel.
~ Christopher
I hope you can!