DCC - Postfix MTA mail hub implementation question

Paul Vixie paul@vix.com
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.

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