Security Labels in Internet Email

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Last updated 2014-06-04 (latest revision 2013-12-01)
Stream ISE
Intended RFC status Informational
Expired & archived
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IETF conflict review conflict-review-zeilenga-email-seclabel
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Stream ISE state In ISE Review
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Document shepherd None
IESG IESG state Expired (IESG: Dead)
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Responsible AD Sean Turner
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This Internet-Draft is no longer active.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 a header field, SIO-Label, for use in Internet Mail to convey the sensitivity of the message. This header field which may carry a textual representation (a display marking) and/or a structural representation (a security label) of the sensitivity of the message. This document also describes a header field, SIO-Label-History, for recording changes in the message's label.


Kurt Zeilenga (
Alexey Melnikov (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)