... is intended to allow delivery of local mails (e.g. system messages, cron results, etc.) to a single local "account" especially on personal workstations and laptops, where a full-scale maile like postfix is overkill and smarthost-forwarders like ssmtp don't work as network is not always available/online.
This does NOT send mail out to other systems or to other accounts, only delivers all local mail to the one singular local account / mailbox
chmod 755 /usr/sbin/sendmail
chmod 777 /var/mail
This software is published under a "Modified BSD" License", an open source license.