Security Labels in Internet Email
RFC 7444, “Security Labels in Internet Email”, is an Informational document published in February 2015 by K. Zeilenga, A. Melnikov. The canonical text is published by the RFC Editor.
Abstract
This document describes a header field, SIO-Label, for use in Internet email to convey the sensitivity of the message. This header field 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.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
The canonical text of RFC 7444 is hosted at rfc-editor.org. Available in TXT,HTML.
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