Quick correction to the mailer.conf(5) man page. Since sendmail is no longer in the default install, the man page has been corrected to reflect that the sendmail binary would be in /usr/local/libexec/sendmail instead of /usr/libexec/sendmail.
Index: mailer.conf.5 =================================================================== RCS file: /cvs/src/usr.sbin/mailwrapper/mailer.conf.5,v retrieving revision 1.17 diff -u -p -u -r1.17 mailer.conf.5 --- mailer.conf.5 8 Dec 2015 09:06:32 -0000 1.17 +++ mailer.conf.5 16 Sep 2018 01:34:31 -0000 @@ -79,13 +79,13 @@ MTA suite in place of .Xr smtpd 8 . .Bd -literal # Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail -sendmail /usr/libexec/sendmail/sendmail -send-mail /usr/libexec/sendmail/sendmail -mailq /usr/libexec/sendmail/sendmail -makemap /usr/libexec/sendmail/makemap -newaliases /usr/libexec/sendmail/sendmail -hoststat /usr/libexec/sendmail/sendmail -purgestat /usr/libexec/sendmail/sendmail +sendmail /usr/local/libexec/sendmail/sendmail +send-mail /usr/local/libexec/sendmail/sendmail +mailq /usr/local/libexec/sendmail/sendmail +makemap /usr/local/libexec/sendmail/makemap +newaliases /usr/local/libexec/sendmail/sendmail +hoststat /usr/local/libexec/sendmail/sendmail +purgestat /usr/local/libexec/sendmail/sendmail .Ed .Sh SEE ALSO .Xr mail 1 ,