%% You should probably cite rfc7208 instead of this I-D. @techreport{ietf-spfbis-4408bis-03, number = {draft-ietf-spfbis-4408bis-03}, 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-spfbis-4408bis/03/}, author = {Scott Kitterman}, title = {{Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1}}, pagetotal = 57, year = 2012, month = jul, day = 5, abstract = {E-mail on the Internet can be forged in a number of ways. In particular, existing protocols place no restriction on what a sending host can use as the reverse-path of a message or the domain given on the SMTP HELO/EHLO commands. This document describes version 1 of the Sender Policy Framework (SPF) protocol, whereby a domain can explicitly authorize the hosts that are allowed to use its domain name, and a receiving host can check such authorization. This document obsoletes RFC4408.}, }