Mapping Between the Multimedia Messaging Service (MMS) and Internet Mail, January 2006
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The cellular telephone industry has defined a service known as the Multimedia Messaging Service (MMS). This service uses formats and protocols that are similar to, but differ in key ways from, those used in Internet mail.
One important difference between MMS and Internet Mail is that MMS uses headers that start with "X-Mms-" to carry a variety of user agent- and server-related information elements.
This document specifies how to exchange messages between these two services, including mapping information elements as used in MMS X-Mms-* headers as well as delivery and disposition reports, to and from that used in SMTP and Internet message headers. [STANDARDS-TRACK]
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.