RFC 7208, "Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1", April 2014

Errata ID: 5843
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Jesus Donaldo Osornio
Date Reported: 2019-08-22

Section 9.1 says:

Received-SPF: pass (mybox.example.org: domain of
    [email protected] designates 192.0.2.1 as permitted sender)
       receiver=mybox.example.org; client-ip=192.0.2.1;
       mechanism=ip4:192.0.2.1; envelope-from="[email protected]";
       helo=foo.example.com;

It should say:

Received-SPF: pass (mybox.example.org: domain of
    [email protected] designates 192.0.2.1 as permitted sender)
       receiver=mybox.example.org; client-ip=192.0.2.1;
       mechanism="ip4:192.0.2.1"; envelope-from="[email protected]";
       helo=foo.example.com;

Notes:

There's an error in the last example of this section:
By the definition of key-value-pair, a "value" can only be a dot-atom or a quoted-string.
The string ip4:192.0.2.1 in the mechanism key is not a legal dot-atom, so it should be surrounded by double quotes, to be a quoted-string instead

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