Scribe is a small, fast, cross-platform, object based email client. Yet it retains a lot of the features that larger mail clients have. There is a free and commercial version of the software.
Our Review: i.Scribe is an email client that features a good-looking interface, with mailboxes are sorted on the left and their contents displayed on the right. It has important functions such as filtering and creating custom mailboxes, as well as a preview function. It is very easy to use, and is recommended for any BeOS user with a POP3 mail account. Best of all - it's free!