The "pop3d" command:
Usage: fossil pop3d [OPTIONS] REPOSITORY
Begin a POP3 conversation with a client using stdin/stdout using
the mailboxes stored in REPOSITORY.
If launched as root, the process first enters a chroot jail using
the directory of REPOSITORY as root, then drops all privileges and
assumes the user and group of REPOSITORY before reading any content
off of the wire.
--logdir DIR Each pop3d session creates a new logfile
in the directory DIR and records a transcript
of the session there. The logfile is opened
before entering the chroot jail.