I have been building my own DNS blacklist over the last years for my own company (ScanMailX) and can see the positive effect of this in the constant battle against spam and other bad stuff which is email borne.
I was wondering whether there would be an interest for you to provide data to this list and in return get access to the total list for your SME server?
The philosophy would be that all users (SME Servers) would have to provide data in order to be allowed to use this DNSBL. This data will be collected automatically via a plugin to qpsmtpd and an associated script that runs on your server.
The plugin will collect information from all (or some) hard rejected emails and send data to the central server which then analyzed and add to the DNSBL. This data that would be sent is sending IP address, sender email address, qpsmtpd module that rejected and the reject message.
Interested?
Regards,
Jesper