SMTP Service Extension for Client Identity

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Document Type Expired Internet-Draft (individual)
Author William Storey 
Last updated 2016-08-04 (latest revision 2016-02-01)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines an extension for the Simple Mail Transfer Protocol (SMTP) called "CID" to provide a method for clients to indicate an identity to the server. This identity is an additional token that may be used for security and/or informational purposes, and with it a server may optionally apply heuristics using this token.


William Storey (

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