Email Analytics: How to Measure Email Marketing Success Beyond Open Rate - Litmus
Briefly

Email open rates have always been a bit of a vanity metric. What makes a high-performing email program successful isn't about how many emails get opened, but how much revenue it generates.
Apple's Mail Privacy Protection hides subscriber IP addresses, making it impossible to accurately determine if someone has opened an email. Open rates have become unreliable due to the lack of detailed engagement data.
Read at Litmus
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