On 1 Jun 2005 at 18:50, Daniel Lafraia wrote about
"[exim] condition failure":
|...
| Later in the transport I'll implement something
| to reply to the sender
How do you propose to ensure that the sender address isn't some
innocent third party whose address was forged by the spamware/malware
sending the message?
| with a "double checker" (a webpage that will
| release the message and add the sender automatically to whitelist).
Challenge/Response systems are abusive spam amplifiers. If you
succeed in implementing it, you're just asking to get your own server
blacklisted.
<http://tardigrade.net/challengeresponse.html>
- Fred
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