> The hole comes from the fact that batch mailers / spammers > who often send in batches of 25/50/100 no longer have do > have greylisting applied to all the intended recipients. > > If the one message from the batch passes through greylisting, then reasonably to assume, that other messages from the batch will pass too. So there is no difference between greylisting on duplet (when recipient is NULL with postfix smtpd_data_restrictions) and triplet (in case of multiply rcpt's per envelope).
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