Alpine is a fast, easy-to-use and open-source terminal-based email client for Unix-like operating systems, based on the Pine messaging system. Alpine also runs on Windows, can be integrated with web-based email user agents.
It works well for new users and experts alike, hence it is user-friendly, you can simply learn how to use it through context-sensitive help. Additionally, you can easily customize it through the Alpine setup command.
Some of its features include:
Support for several protocols such as IMAP, POP, SMTP and so on
Packaged with Pico text editor
Supports context-sensitive help on screen
Not actively developed plus many more