DWMail is without any doubt one of the best webmail systems I've come across. It is easy to install with only a few needed parameters to setup and it works! It doesn't only work, it works FAST! Even without a database. Customization is a bit cumbersome but you can change most things to your liking. Of all the webmail systems I've tested (well-known ones and less obvious ones) this one is by far a winner. If your looking for a fast and easy webmail for your shared (limited) hosting, take a look at this one, you'll be surprised! The $38 is well worth it.