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RFC 2554 - SMTP Service Extension for Authentication

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SMTP Service Extension for Authentication (RFC 2554, ; obsoleted by RFC 4954)

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RFC 2554: SMTP Service Extension for Authentication

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https://datatracker.ietf.org/doc/html/rfc2554

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IETF Datatracker

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This document defines an SMTP service extension [ESMTP] whereby an SMTP client may indicate an authentication mechanism to the server, perform an authentication protocol exchange, and optionally negotiate a security layer for subsequent protocol interactions. [STANDARDS-TRACK]

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