Not correcting you as I feel there is an abundance of garbage traffic generated by bouncing mail for the reasons you indicate. However it has been my experience that bounces are a necessary evil when implementing spam filtering .
Then you will get blocked, and I can't feel sorry for you. :)
When I said bounce I did not mean an actual auto-ack. I am referring to 55* response codes which will get back to the sender. I should have read up on what the OP was asking about before piping in.
Ah, that is quite different. :) IMail can't do that, unfortunately.
So with a Declude solution you are just accepting junk mail and sending it to the bit-bucket with no response whatsoever that the mail was rejected?
There are about a dozen different actions in Declude JunkMail. :) So you have many options of what to do with the spam. While bouncing is one of the options, we strongly discourage it.
The problem is that you are saying two very important -- "I must block spam and not have any false positives" and "I'm happy having some innocent victim check for my false positives, so that I don't have to."
This is not the case by any means. False positives are few and far between here but they do happen. If you do not or have never had any false positives while blocking 100% of spam then you have a perfect environment.
What you seemed to be saying was that false positives were completely unacceptable, and you would bounce E-mail to ensure that the sender would know that their E-mail was being treated as spam (that's the only reason to bounce it -- so the legitimate senders can re-send).
But we did not realize that you were using non-IMail software to do this, which allows you to reject the E-mail during the SMTP transaction.
-Scott
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