root@vault:/var/log# tail mail.log
Feb  8 15:54:47 vault sm-mta[13029]: q18Krg8j013029: from=no-reply@vwavault.int, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Feb  8 15:55:57 vault sm-mta[13047]: q18Ksmah013047: from=telnet@localhost, size=240, class=0, nrcpts=1, msgid=<kllsd0817184815.33912@larose>, proto=SMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Feb  8 15:55:59 vault sm-mta[13071]: STARTTLS=client, relay=vwadesign.com., version=TLSv1/SSLv3, verify=FAIL, cipher=AES256-SHA, bits=256/256
Feb  8 15:55:59 vault sm-mta[13071]: q18Ksmah013047: to=claycomb@vwadesign.com, delay=00:00:17, xdelay=00:00:02, mailer=esmtp, pri=120240, relay=vwadesign.com. [184.172.58.118], dsn=5.1.1, stat=User unknown
Feb  8 15:55:59 vault sm-mta[13071]: q18Ksmah013047: to=telnet@localhost, delay=00:00:17, mailer=local, pri=120240, dsn=5.1.1, stat=User unknown
Feb  8 15:55:59 vault sm-mta[13071]: q18Ksmah013047: q18Ktxah013071: postmaster notify: User unknown
Feb  8 15:56:00 vault sensible-mda[13073]: No MDA was found! Tried: /etc/mail/smrsh/procmail, /etc/mail/smrsh/maildrop, /etc/mail/smrsh/deliver, and /etc/mail/smrsh/mail.local.
Feb  8 15:56:00 vault sm-mta[13071]: q18Ktxah013071: to=root, delay=00:00:01, xdelay=00:00:01, mailer=local, pri=30000, dsn=4.0.0, stat=Deferred: local mailer (/usr/sbin/sensible-mda) exited with EX_TEMPFAIL
Feb  8 15:56:43 vault sensible-mda[13089]: No MDA was found! Tried: /etc/mail/smrsh/procmail, /etc/mail/smrsh/maildrop, /etc/mail/smrsh/deliver, and /etc/mail/smrsh/mail.local.
Feb  8 15:56:43 vault sm-mta[13088]: q18Ktxah013071: to=root, delay=00:00:44, xdelay=00:00:00, mailer=local, pri=120000, dsn=4.0.0, stat=Deferred: local mailer (/usr/sbin/sensible-mda) exited with EX_TEMPFAIL