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RFC 2919, "List-Id: A Structured Field and Namespace for the Identification of Mailing Lists", March 2001

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app
See Also: RFC 2919 w/ inline errata

Errata ID: 3951
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Peter Occil
Date Reported: 2014-04-03
Verifier Name: Pete Resnick
Date Verified: 2014-04-04

Section 3 says: 

   The syntax of the List-Id header follows:

   list-id-header = "List-ID:" [phrase] "<" list-id ">" CRLF

It should say:

   The syntax of the List-Id header follows:

   list-id-header = "List-ID:" [phrase / CFWS] "<" list-id ">" CRLF

Notes:

This change is needed to conform with the second and fifth examples
given just after the syntax definition. Without it, the case "List-ID: <list.example.com>" (with a space after "List-ID:") would not be valid; only "List-ID:<list.example.com>" (without a space) would be, especially since it states that "the List-Id header does not allow free insertion of whitespace and comments around tokens."

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