/usr/lib/mh/spost is in nmh 1.7.1~RC3-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #! /bin/sh
#
# spost -- delivers a message to local sendmail using its -t option
#
# This code is Copyright (c) 2012, by the authors of nmh. See the
# COPYRIGHT file in the root directory of the nmh distribution for
# complete copyright information.
#
# Emulates old spost(8) using post(8).
prefix=''
exec_prefix="${prefix}"
exec "${prefix}/usr/lib/mh/nmh/post" -mts sendmail/pipe "$@"
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