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Email Authenticity 101: DKIM, DMARC, and SPF — Alex Blackie
[https://www.alexblackie.com/articles/email-authenticity-dkim-spf-dmarc/?utm_source=hackernewsletter&utm_medium=email&utm_term=fav] - - public:xxx
Email explained from first principles
[https://explained-from-first-principles.com/email/] - - public:xxx
Everything about the email and smtp protocol
