It appears that Steffen Nurpmeso <steffen(_at_)sdaoden(_dot_)eu> said:
I am only implementing a greylisting daemon, a standardized
anti-spam aka anti-abuse policy, then further hopefully next week, ...
Everyone I know who does greylisting with Postfix uses Postgrey,
available here:
https://postgrey.schweikert.ch/
Are you sure you need to reinvent this particular wheel?
R's,
John
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