Contributed by grey on from the DIY postfix improvements dept.
Since OpenBSD ships with an older version of Postfix, I added the web form and cgi processing necessary to add black white and graylisting to the mail delivery system and modified my custom filter script to request that the recipient vouch for suspicious senders. A brief explanation and the code that does it is available here.
Readers should also make note of Postgrey available in ports. Additionally, the ports tree has relatively up to date Postfix snapshots. And of course, there have been other greylisting stories mentioned previously for different MTA's.
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