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If you update your configuration from 8.9.x add the following to your
'*.mc' file(s):

MODIFY_MAILER_FLAGS(`LOCAL', `+S')dnl

because mail.local is no longer installed set-user-id root.  This is not
needed if you are using FEATURE(`local_lmtp').

To activate sendmail as your default mailer, call the target 'mailer.conf':

$ make mailer.conf

Your '/etc/mail/mailer.conf' should look like this:

#
# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
#
sendmail	%%PREFIX%%/sbin/sendmail
send-mail	%%PREFIX%%/sbin/sendmail
mailq		%%PREFIX%%/sbin/sendmail
newaliases	%%PREFIX%%/sbin/sendmail

You may also need to update /etc/rc.conf.

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