The Death of Decentralized Email

The next major development in email deliverability included the standardization of reputation scores. ‘SenderScore’ and other reputation systems emerged at this time. False positives were further reduced by adding sender authentication mechanisms like Sender Policy Framework, SenderID, and Domainkeys Identified Mail. Of course, if you’re familiar with how these technologies work then you’ll notice that most of them are reliant upon centralized gatekeepers who assign IP addresses and control domain registrations.

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