SMTP and SUBMISSION Service Extensions For Address Query

Document Type Expired Internet-Draft (individual)
Last updated 2016-01-20 (latest revision 2015-07-19)
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This Internet-Draft is no longer active.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 several mechanisms which can be used by a client such as a Mail User Agent or Mail Submission Agent, to query an SMTP server which is configured to accept incoming mail for a mail domain, to obtain information associated with an email address based in that domain. Among other purposes, these mechanisms are intended to facilitate discovery of senders' and/or recipients' public keys for use in automatic verification of whole-message digital signatures and automatic whole-message encryption of email sent to recipients.


Keith Moore (
Chris Newman (

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