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Re:Dear Email Industry, We’ve Got a GDPR Problem by gnud on Friday September 20, 2019 @07:34AM (#21025458)
Have them click a link to acknowledge receipt.

A tracking pixel hit only means that that the email was received and loaded in some email client, not that it was read (in detail, or at all), understood, or acted on.

Re:Dear Email Industry, We’ve Got a GDPR Problem by TeMPOraL on Friday September 20, 2019 @07:34AM (#21025464)
Moreover, a lack of tracking pixel hit doesn't mean the e-mail wasn't loaded, much less that it wasn't read, understood or acted on.