Fri Aug 23 16:48:47 UTC 2002
> For postfix the dominant cost is not fork/exec but management of the > queue files. The postfix content filtering scheme involves the mail > totally leaving the postfix universe (it is effectively "delivered" to > the content filter), so the queue file is deleted. [...] there is no way under that model to reject the mail before the final-ok after the DATA/. verb, so that the mail stays with the spammer's mailer (or the open relay or whatever). there has to be a way to do synchronous rejection. attempting to bounce spam after accepting that DATA/. verb is just not worthwhile.
More information about the DCC