This file is indexed.

/usr/lib/mh/spost is in nmh 1.6-2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /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/post" -mts sendmail/pipe "$@"