On Sat, Sep 20, 2003 at 09:30:27AM -0400, Steven W. Orr wrote: > > Ok. Maybe there's another explanation. See, SA can be used by lots of > different people. Trolls included. Not everyone uses SA by piping it > through procmail. I know; the better people do it that way, but I prefer > to reject all of my spam before reception is complete by using > spamass-milter with sendmail and rejecting during reception, rather than > using the Hansel and Gretel approach with procmail. You can block mail at (basically) four points during mail reception:
* During the HELO/EHLO * During or after you receive envelope information * At the *end* of data but before you have decided to accept the message and sent a 250 return code to the client * After you have accepted the mail but before its next hop (either delivery to a mailbox or relay to another server) The first 3 of those stages you can send a 5xx return code and the sender knows right there that you rejected the message. In the last case, you have to generate a bounce to the envelope sender, which in the case of most spam and email-borne viruses will be forged. So you'd prefer to reject unwanted mail as early as possible in the SMTP transaction. There's not, for practical purposes, any way to cut off a message in the middle of the DATA stage, which is what you seem to want to do. Having given the client the OK to send data, it'll just send the whole lot down your pipe and wait for an answer. I don't know about milter, but in the case of postfix, body checks are enforced at the *end* of data and content filters generate bounces. With SA, you have to receive the whole message to make any sense of it, so you basically can't hope to save bandwidth based on anything you spot in the message contents. Everyone uses SA by piping it through something, be it procmail, amavis, milter, or something else entirely. Something has to read and act on the data SA adds to the message. I'm oversimplifying a bit, but not much. regards rob c ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Spamassassin-talk mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/spamassassin-talk
