One thing to be aware of is some clients certainly used to not try
ESMTP unless they saw ESMTP in the greeting banner... no idea if
thats still the case, but if it still applies you will be blocking
authentication, encryption, size handling and many other good
things to those clients.
Nigel.
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[ Nigel Metheringham Nigel.Metheringham@??? ]
[ - Comments in this message are my own and not ITO opinion/policy - ]