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2008‑10‑01 – RFC 821 -> 2821 -> 5321 - Simple Mail Transfer Protocol.

• 2008‑10‑01 - RFC 821 -> 2821 -> 5321 - Simple Mail Transfer Protocol.
• http://www.rfc-editor.org/rfc/rfc5321.txt
• redirect https://dotat.at/:/U9F6E
• blurb https://dotat.at/:/U9F6E.html
• atom entry https://dotat.at/:/U9F6E.atom
• web.archive.org archive.today