These links:

http://dag.wieers.com/rpm/packages/pine/pine-4.64-3.el4.rf.i386.rpm http://staff.washington.edu/chappa/pine/info/maildir.html

on this page

https://wiki.dovecot.org/Migration/MailFormat

at the Dovecot wiki do not lead to useful results.

I lost the context of this thread, but if you're looking for mailutil or the older pine stuff, the project has forked inti alpine and you can find the source tarball at

https://alpineapp.email/

Joseph Tam <jtam.home@gmail.com>