A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Using TLS in Applications WG of the IETF.

        Title           : SMTP TLS Reporting
        Authors         : Daniel Margolis
                          Alexander Brotman
                          Binu Ramakrishnan
                          Janet Jones
                          Mark Risher
        Filename        : draft-ietf-uta-smtp-tlsrpt-15.txt
        Pages           : 26
        Date            : 2018-02-19

   A number of protocols exist for establishing encrypted channels
   between SMTP Mail Transfer Agents, including STARTTLS, DANE TLSA, and
   MTA-STS.  These protocols can fail due to misconfiguration or active
   attack, leading to undelivered messages or delivery over unencrypted
   or unauthenticated channels.  This document describes a reporting
   mechanism and format by which sending systems can share statistics
   and specific information about potential failures with recipient
   domains.  Recipient domains can then use this information to both
   detect potential attackers and diagnose unintentional

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