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RFC 821 - Simple Mail Transfer Protocol

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Simple Mail Transfer Protocol (RFC 821, ; obsoleted by RFC 2821)

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RFC 821: Simple Mail Transfer Protocol

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https://datatracker.ietf.org/doc/html/rfc821

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IETF Datatracker

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The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. SMTP is independent of the particular transmission subsystem and requires only a reliable ordered data stream channel. Obsoletes RFC 788, 780, and 772.

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