On 14/10/2019 14:58, Nick via mailop wrote:

My question remains unanswered.  Why not treat each ip address on its
own merits?  Is it technically infeasible, too expensive, less
convenient, or what?

There's more than one reason. Some are technical.

But also expending the effort to track an ever-changing
set of reputation-IP pairs against hostile actors is subsidizing
providers whose business model relies on allowing customers
to send malicious traffic, including unwanted email, to the
customers of those who are being asked to expend that effort.

Cheers,
  Steve



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