in /etc/mail.

/usr/libexec/locate.updatedb does run as nobody the redirection is
done as root so the resulting file is owned by root.
sync log file owner/mode with what is is newsyslog.conf

"The mailwrapper program is designed to replace /usr/sbin/sendmail and to
invoke an appropriate MTA instead of sendmail(8) based on configuration
information placed in /etc/mailer.conf. This permits the administrator to
configure which MTA is to be invoked on the system at run time."
OK deraadt, millert

This avoids creating of incorrect symlink ${HOME}/sys -> usr/src/sys when
DESTDIR="".

files.