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(EditHint: Are you saying don't bounce at all ? Or is there an envelope-from that's different from the "From:" in the subject line that I *can* bounce to ?) Reply: don't bounce spams at all. You can't trust any portion of the message, including the envelope info. If you bounce spam, you're just contributing to the effectiveness of Joe Jobs. The rest of this page is in error. The only way to block spam is to deny it before your mailer accepts it for delivery.

Here's a recipe that I use with qmail and maildrop (if you use e.g. sendmail and procmail instead, it will not work) to delete and bounce all spam messages:

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