What are the most important RFCs for email (5321, 5322, 7208, etc.)?
The most important RFCs for email include RFC 5321 (Simple Mail Transfer Protocol, SMTP), which defines how mail servers communicate, and RFC 5322 (Internet Message Format), which specifies email header and body structure.
Authentication RFCs include RFC 7208 (SPF), RFC 6376 (DKIM), and RFC 7489 (DMARC). These define the mechanisms that verify sender identity and prevent spoofing.
Additional important RFCs include RFC 8058 (List-Unsubscribe), RFC 8617 (ARC), RFC 8461 (MTA-STS), and various MIME RFCs for content encoding. Together these documents form the technical foundation of modern email.
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