This allows one to email address book entries to someone else so that they can be imported straight into Pine. The addressbook file itself is almost plain text and quite readable by humans. This is where all email sent to that address ends up. The default is the default sent-mail folder. A useful comment field is included.
Setup options are overwhelming, but help is available and considerable customization is possible.
It is context-sensitive and hyperlinked. Custom header definition is a useful feature for those that would have their own additional headers on their messages. You can specify any extra headers, including X-headers. Mailing list support in Pine is excellent. The address book has crude mailing list addressing support.