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RFC 5321, "Simple Mail Transfer Protocol", October 2008

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

Errata ID: 5414
Status: Reported
Type: Technical

Reported By: David Romerstein
Date Reported: 2018-06-29

Section 4.1.2 says:

Quoted-string  = DQUOTE *QcontentSMTP DQUOTE

It should say:

Quoted-string  = DQUOTE 1*QcontentSMTP DQUOTE

Notes:

As written, this allows for an email envelope recipient (Forward-path) with a NULL value for the local part of their address. This is a functional departure from similar wording in the preceding RFC 821, which defines quoted-string in such a way as to require at least one character that is not one of the surrounding quotation marks.

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