At 10:29 -0400 on 06/28/2005, Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote about Re:
Bounce/System Notification Address Verification:
OK, let's throw out support for HELO
It SHOULD be thrown out for Port587 MSA SMTP Servers since it is an
INVALID Command to send to start a session with such Servers since it
will not trigger the required 220 reply with the AUTH listing of
supported methods needed to send the authentication credentials.