RFC 1873: Message/External-Body Content-ID Access Type

The existing MIME Content-Type Message/External-Body access-types allow a MIME entity (body-part) to refer to an object that is not in the message by…

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Outgoing relationships (1 related RFC)

Informative reference — RFC 1521: MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies

Incoming relationships (2 related RFCs)

Informatively referenced by — RFC 2387: The MIME Multipart/Related Content-type
Informatively referenced by — RFC 3391: The MIME Application/Vnd.pwg-multiplexed Content-Type