/usr/bin/lockmail.maildrop
/usr/bin/mailbot
/usr/bin/maildirmake.maildrop
/usr/bin/maildrop
/usr/bin/makedat.maildrop
/usr/bin/makedatprog
/usr/bin/makemime
/usr/bin/reformail
/usr/bin/reformime
/usr/sbin/deliverquota.maildrop
You may install this package on Debian with
apt-get
install maildrop