I've set up DCC within Spamassassin, and enabled greylisting. At first, I couldn't see any mails being "bounced", pending a re-tramsmission, until I realised that all the e-mails I was looking at were maked as spam by SA, in which case, my understanding is that it's a waste of time asking for a re-transmission, as they're already identified as spam.
However, the first "genuine" e-mail that i received, also was passed though immediately, instead of being "bounced", for a re-send. When I checked the DCC log for that particular message, it stated: "result: temporary greylist embargo". However, it was immediately passed though to the destination mailbox. So, why was it then that this message wasn't "held", to prove it wasn't spam. Or, have I still got problems with my configuration. Cheers.