Dnia 31.10.2023 o godz. 11:09:52 Stuart Henderson via mailop pisze:
> 
> SPF syntax allows expressing policy which can't be converted to a
> simple list of addresses (the policy can include further DNS
> lookups based on sender localpart/domain, IP address, etc).
> 
> So it's not possible to produce a complete list like this.

May I suggest a bit different approach, not based on SPF:

postgrey, the "reference" greylisting daemon for Postfix, comes with a
configuration file "whitelist_clients" that lists senders that exhibit "no
retry" or "random IP retry" behaviour simply by their domain name, FQDN
patterns or IP ranges. Maybe just grab this file and try to make some use of
it.
-- 
Regards,
   Jaroslaw Rafa
   [email protected]
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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