RFC 1651: SMTP Service Extensions

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…

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Outgoing relationships (3 related RFCs)

Obsoletes — RFC 1425: SMTP Service Extensions
Informative reference — RFC 1521: MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies
Informative reference — RFC 1522: MIME (Multipurpose Internet Mail Extensions) Part Two: Message Header Extensions for Non-ASCII Text

Incoming relationships (7 related RFCs)

Obsoleted by — RFC 1869: SMTP Service Extensions
Informatively referenced by — RFC 1700: Assigned Numbers
Informatively referenced by — RFC 1652: SMTP Service Extension for 8bit-MIMEtransport
Informatively referenced by — RFC 1891: SMTP Service Extension for Delivery Status Notifications
Informatively referenced by — RFC 1845: SMTP Service Extension for Checkpoint/Restart
Informatively referenced by — RFC 1854: SMTP Service Extension for Command Pipelining
Informatively referenced by — RFC 1653: SMTP Service Extension for Message Size Declaration