Date   : Tue, 21 Sep 1982 08:02:00-EDT
From   : Frank J Wancho <FJW@Mit-Mc>
Subject: Why...

The bounce of large-list mail, such as to INFO-CPM and INFO-MICRO, via
BRL, then BRL-BMD, and back to BRL, is a hack to get around the
problem that when it was direct, certain hosts would timeout while BRL
verified every entry in the destination list.  It was more of a waste
when the mail did not get through at all.