%% You should probably cite rfc8460 instead of this I-D. @techreport{ietf-uta-smtp-tlsrpt-19, number = {draft-ietf-uta-smtp-tlsrpt-19}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-uta-smtp-tlsrpt/19/}, author = {Daniel Margolis and Alex Brotman and Binu Ramakrishnan and Janet Jones and Mark Risher}, title = {{SMTP TLS Reporting}}, pagetotal = 29, year = 2018, month = may, day = 2, abstract = {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 attacks and diagnose unintentional misconfigurations.}, }