It appears that postfix--- via mailop <[email protected]> said:
>Hello list, may I pick the accumulated wisdom and experience?
>
>any useful traffic from these subnets:
>
>18.32.0.0 - 18.255.255.255 Amazonaws.com

I get a fair amount of real mail mixed in with the crud, mail from Quora
to its users, proxyvote mail from stock brokers, and the occasional DMARC 
report.

>34.4.5.0 - 34.63.255.255 Googleusercontent.com

On the other hand, I see nothing but garbage from that range.

>64.62.197.0/24 shadowserver.org

As mentioned, they're nice.  I know the guy who runs it.

>141.98.10.0/24 hostbaltic / tiscali.it?

Put them in the bit bucket in 2023, see no reason to reconsider.

R's,
John


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