%% You should probably cite rfc7410 instead of this I-D. @techreport{ietf-appsawg-authres-ptypes-registry-01, number = {draft-ietf-appsawg-authres-ptypes-registry-01}, 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-authres-ptypes-registry/01/}, author = {Murray Kucherawy}, title = {{A Property Types Registry for the Authentication-Results Header Field}}, pagetotal = 5, year = 2014, month = aug, day = 25, abstract = {{[}RFC7001{]} describes a header field called Authentication-Results for use with electronic mail messages to indicate the results of message authentication efforts. Any receiver-side software, mainly Mail Transfer Agents (MTAs) or mail filters, can add or use this header field to relay that information in a convenient and meaningful way to later-stage systems, such as for sorting and filtering decisions. One portion of the definition in that document limits the types of authentication properties about a message to a small, fixed set. This document updates the specification, making it extensible to allow new property types to be declared and used.}, }