%% You should probably cite rfc7672 instead of this I-D. @techreport{ietf-dane-smtp-with-dane-06, number = {draft-ietf-dane-smtp-with-dane-06}, 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-dane-smtp-with-dane/06/}, author = {Viktor Dukhovni and Wes Hardaker}, title = {{SMTP security via opportunistic DANE TLS}}, pagetotal = 29, year = 2014, month = feb, day = 13, abstract = {This memo describes a downgrade-resistant protocol for SMTP transport security between Mail Transfer Agents (MTAs) based on the DNS-Based Authentication of Named Entities (DANE) TLSA DNS record. Adoption of this protocol enables an incremental transition of the Internet email backbone to one using encrypted and authenticated Transport Layer Security (TLS).}, }