pine

Availability and IPv6 support

Name	IPv6 support	Supported operating systems
pine	included since 4.60	Unix, Linux, *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