pine

Availability and IPv6 support

Name	IPv6 support	Supported operating systems
[http://www.washington.edu/pine pine]	included since 4.60	Unix, Linux, [http://www.freshports.org/search.php?query=pine *BSD]

Pine is a tool for reading, sending, and managing electronic messages. Pine was developed by Computing & Communications at the University of Washington. Though originally designed for inexperienced email users, Pine has evolved to support many advanced features, and an ever-growing number of configuration and personal-preference options.

Windows version probably also supports IPv6

Tested and used in Campus IPv6 project

FreeBSD port collection