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What are the most important email security protocols?

Email security has evolved significantly since the advent of internet email protocols, demonstrating that, as Andrew S. Tanenbaum once said, “The nice thing about standards is that you have so many to choose from.” Today, there are numerous email security protocols, including SSL/TLS for HTTPS, SMTPS, StartTLS, SMTP MTA-STS, SPF, DKIM, DMARC, S/MIME, OpenPGP, and the use of digital certificates, all designed to strengthen different aspects of email security.

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