KMail is a simple mail application that comes pre-installed on Red Hat Linux and other Linux operating systems. In addition to handling e-mail, KMail is also useful for organizing events with its built in Calendar and Contact Manager.
System Requirements: Linux
Download KMail
--Getting Started Guide
Junk Mail Settings and Handling
KMail User Documentation
KMail Main Window
KMail Basic Features
Referenced from: apps.kde.org/kmail2