Postfix: Delay "ready" response

I'm setting up a Postfix server and I would like to delay the "ready" handshake when a connection opens by a few seconds.  It's an experiment to slow down spammers and to hopefully keep them from account harvesting.  Is this possible?
phasevarAsked:
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PsiCopCommented:
Dunno. It's possible in sendmail v8.13.x, using the GREETPAUSE Feature. PostFix just added limited sendmail MILTER support, so adding something like GREETPAUSE may be forthcoming.
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