SMTP is such a shitty protocol with layers of opaqueness on top due to centralization and ossification. It's amazing that so many people are able to use it successfully.

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Gmail is the worst because they quietly shadowban you. At least Microsoft and Yahoo have the balls to say they're rejecting your delivery.
SMTP is owned and controlled by pedos, billionaires, the CIA and Mossad. Epstein files confirmed that all these people are using email regularly. SMTP is also quantum vulnerable and quantum insiders will be able to steal all your emails including the first emails ever sent.