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RFC 2821 - Simple Mail Transfer Protocol

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Simple Mail Transfer Protocol (RFC 2821, ; obsoleted by RFC 5321)

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RFC 2821: Simple Mail Transfer Protocol

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https://datatracker.ietf.org/doc/html/rfc2821

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IETF Datatracker

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This document is a self-contained specification of the basic protocol for the Internet electronic mail transport. [STANDARDS-TRACK]

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