----- On Aug 22, 2020, at 3:35 PM, Kenneth Porter sh...@sewingwitch.com wrote:

>> Like most ISPs, they have a feedback loop to remove malicious users.  I
>> assume it is too slow, so a SendGrid account ID RBL would provide
>> meaningful value.
> 
> Would not Pyzor accomplish the same thing? Submit the SendGrid spam to
> Pyzor to quickly get it blacklisted.

SA has multiple overlapping metrics.  As long as they are not fully 
overlapping, each adds to spam/ham assurance.

As Rob points out, it's also valuable to prioritize low-cost tests on inbound 
mail -- matching a sender ID is simpler than a message digest.

--Jered

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