Sender Identity

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Disposable domains and the economics of sender replacement | Dead Internet Theory

Dead Internet Theory: When domains are cheap and easy to replace, abusive senders can treat reputation as expendable inventory, abandoning an identity once filters and blocklists catch up.

Email authentication as an identity check rather than proof of consent | Dead Internet Theory

Dead Internet Theory: SPF, DKIM, and DMARC can help establish that a message is authorized by a sending domain, but authentication does not prove that the recipient asked for the message or still wants it.