Yes, there always is someone who just doesn't understand what they are
talking about.
/usr/sbin/sendmail -t
From: lyndon(_at_)idiotsRus(_dot_)org
To: goofball(_at_)moronsthatcantusesendmail(_dot_)org
Subject: Lyndon can't figure out how sendmail works
Sendmail doesn't route messages in MUA mode.
.
Sendmail has completely different internal procedures to handle -t
--Dean