There are many newsgroups that are dedicated to Linux, which are a useful means of getting support from fellow Linux users. It has many features for easy news reading, posting, and downloading binary attachments to articles. It has a similiar feel and look to Agent, the popular Windows newsreader Agent - this Windows program runs extremely well under wine. It is probably the most featured newsreader available. Even though it runs under emulation it is still a great newsreader, and is especially suited from someone coming from a Windows background to Linux.
Agent also has an email client built in.
Trn - a threaded version of rn, which is a replacement for the readnews program. The license is BSD-like. GNU - GNU is Not Unix. A project to replace Unix with GPL'd software.