%% You should probably cite rfc7372 instead of this I-D. @techreport{ietf-appsawg-email-auth-codes-05, number = {draft-ietf-appsawg-email-auth-codes-05}, 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-appsawg-email-auth-codes/05/}, author = {Murray Kucherawy}, title = {{Email Authentication Status Codes}}, pagetotal = 7, year = 2014, month = jul, day = 21, abstract = {There is at present no way to return a status code to an email client that indicates a message is being rejected or deferred specifically because of email authentication failures. This document registers codes for this purpose.}, }