On Mon, 18 Jun 2007, David F. Skoll wrote:
4) It is perfectly possible to delay the client before EHLO. That's what
Sendmail's greet_pause feature does. However, it's *not* designed to be
a tarpitting mechanism. Rather, it's designed to detect SMTP clients
that send everything in one burst without waiting for the initial greeting
(and also to detect clients that use broken proxy servers.)
Actually, greet_pause is nowadays for detecting bad clients with
excessively short timeouts. Bad clients stopped sending all smtp
commands in one go about two years ago.
Tony.
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