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A comment on Google Is Eating Our Mail. Parent comment

Re:Google Is Eating Our Mail by wtfrmyinitials on Friday April 26, 2019 @04:01PM (#19761277)
> 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?

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Re:Google Is Eating Our Mail by necovek on Friday April 26, 2019 @04:36PM (#19761511)
This was a response to a complaint about not receiving emails from some "people/domains" even when whitelisted, and I highlighted how this can be hard for a service to detect reliably.

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.

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