On Sun, May 31, 2020 at 3:38 PM Eric Allman <tuhs@eric.allman.name> wrote:

but it did have a separate program for sending (called "send" I think) that would
have been fairly easy to hack. It still had "inc" (incorporate) to
bring mail from the /var/mail one-file-per-mailbox format into the MH
one-file-per-message format

Right, the hooks were in send(1mh) and inc(1mh).

Clem