> anyone can send an email with any "from" address, and filtering on people/domains in the "from" field is basically pointless if you want to catch spam.
Isn’t this the exact thing that DKIM is designed to fix?
Isn’t this the exact thing that DKIM is designed to fix?
So yes, DKIM will help a receiving server know for sure, but a receiving server still needs to accept emails from non-DKIM-enabled servers, and perhaps that's why whitelisting didn't work for the parent.