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RFC 1870 - SMTP Service Extension for Message Size Declaration

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SMTP Service Extension for Message Size Declaration (RFC 1870, )

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RFC 1870: SMTP Service Extension for Message Size Declaration

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https://datatracker.ietf.org/doc/html/rfc1870

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IETF Datatracker

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This memo defines an extension to the SMTP service whereby an SMTP client and server may interact to give the server an opportunity to decline to accept a message (perhaps temporarily) based on the client's estimate of the message size. [STANDARDS-TRACK]

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