It looks like (according to the documentation that I found) that this
is what it is supposed to do, but what I'm experiencing doesn't
coincide with the documentation.
http://www.sendmail.org/~ca/email/doc8.8/op-sh-4.html
"When trying to open a connection the cache is first searched. If an
open connection is found, it is probed to see if it is still active by
sending a RSET command. It is not an error if this fails; instead, the
connection is closed and reopened."
Thanks,
Hank