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RFC 5322, "Internet Message Format", October 2008

Note: This RFC has been updated by RFC 6854

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app

Errata ID: 3135
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Ashley Willis
Date Reported: 2012-02-25
Held for Document Update by: Barry Leiba
Date Held: 2019-11-13

Section 3.2.4 says: 

   quoted-string   =   [CFWS]
                       DQUOTE *([FWS] qcontent) [FWS] DQUOTE
                       [CFWS]

It should say:

   quoted-string   =   [CFWS]
                       DQUOTE ((1*([FWS] qcontent) [FWS]) / FWS) DQUOTE
                       [CFWS]

Notes:

The text following this definition states that a "quoted-string is identical to atom, semantically." "Semantically, neither the optional CFWS outside of the quote characters nor the quote characters themselves are part of the quoted-string; the quoted-string is what is contained between the two quote characters."

The published definition allows, for example, an angle-addr of <""@ietf.org> which is equivalent to <@ietf.org>, hence invalid. The corrected definition ensures that at a minimum there is one FWS or qcontent between each DQUOTE.

Currently allowed yet invalid: <""@ietf.org>, <foo.""@ietf.org>, <"".bar@ietf.org>, and <foo."".bar@ietf.org>.

As a quoted-string must be bound by the ends of the local-part or by a dot, there is no change in regard to the currently invalid addresses such as <foo""@ietf.org>, <""bar@ietf.org>, and <foo""bar@ietf.org>.

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