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RFC 1651 - SMTP Service Extensions

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SMTP Service Extensions (RFC 1651, ; obsoleted by RFC 1869)

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RFC 1651: SMTP Service Extensions

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https://datatracker.ietf.org/doc/html/rfc1651

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IETF Datatracker

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This memo defines a framework for extending the SMTP service by defining a means whereby a server SMTP can inform a client SMTP as to the service extensions it supports. [STANDARDS-TRACK]

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