Ola,
It's unclear to me what you are trying to accomplish with this policy:
  1. ensure ripe members have a working (as in receiving mail) abuse email address;
  2. ensure ripe members have a working abuse email address and process incoming mails;
  3. ensure ripe members have a working abuse email address and read it;
  4. ensure ripe members have a working abuse email address and act responsibly on notices.
It seems you want to verify that a human reads the abuse box. However this will tell you nothing about how an organisation actually deals with abuse. So it will only burden ripe members to no avail.

It is my belief ripe should stick to technical verification that a abuse email box exists and is able to receive mail. Ripe is not the internet sheriff :)

Cheers,
Alex

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IDGARA | Alex de Joode | +31651108221