RFC 7208, "Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1", April 2014Source of RFC: spfbis (app)
Errata ID: 4751
Reported By: Ken Mortimer
Date Reported: 2016-07-27
Section 5.5 says:
This mechanism matches if o the <target-name> is a subdomain of a validated domain name, or o the <target-name> and a validated domain name are the same.
It should say:
This mechanism matches if o a validated domain name is a subdomain of the <target-name>, or o the <target-name> and a validated domain name are the same.
The first bullet point is in contradiction to the description of the ptr mechanism evaluation in the preceding paragraph:
"Check all validated domain names to see if they either match the <target-name> domain or are a subdomain of the <target-name> domain. If any do, this mechanism matches. If no validated domain name can be found, or if none of the validated domain names match or are a subdomain of the <target-name>, this mechanism fails to match."