Unless I'm mistaken, Fedora did what you describe- it configured sendmail to send to user mailboxes in /var/spool/mail. The argument for removing it was that on

Unless I'm mistaken, Fedora did what you describe- it configured sendmail to send to user mailboxes in /var/spool/mail. The argument for removing it was that on most installs nobody checks those mailboxes, making it the equivalent of /dev/null with the downside of potentially using all your disk space.