For the original message the logs give
Apr 21 22:40:38 David-Conroys-Computer sendmail[26576]: h3LNHo5o024120: to=dconroy123@yahoo.com, ctladdr=<dconroy@david-conroys-computer.local> (501/20), delay=03:22:48, xdelay=00:00:00, mailer=esmtp, pri=390622, relay=mx4.mail.yahoo.com., dsn=4.0.0...