The Qpopper MIME Mangling and Macro Extensions to POP3

Document Type Expired Internet-Draft (individual)
Author Randall Gellens 
Last updated 2008-11-17
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes two extensions to the POP protocol that have been supported for several years by some client and servers. One extension, MANGLE, allows clients to request that MIME body parts be removed or converted to a simpler format, that only selected headers be transmitted, and/or for the message to be transcoded to a different character set. The other extension, MACRO, allows clients to define macros which are expanded when used, saving repetitive transmissions. The MANGLE extension has been useful in at least two situations: it allows clients on constrained devices to avoid downloading body parts which cannot be used on the device, and clients which use the TOP command to "peek" at messages can have the preview transformed into more usable content, as well as avoiding the transmission of undesired headers. The MACRO extension has been especially useful in conjunction with MANGLE, since a MANGLE request can become relatively lengthy.


Randall Gellens (

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