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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

Errata ID: 361
Status: Rejected
Type: Editorial
Publication Format(s) : TEXT
Reported By: Trish Lynch
Date Reported: 2002-08-08
Rejected by: Alexey Melnikov
Date Rejected: 2010-05-11

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] "<" list-id ">" CRLF

Notes:

In order to bring it in line with the examples, and with common usage (by
the RFC, the List-ID is correct) most mail readers use the example and
do not consider the LHS case insensitive, since the RFC says:

The list header fields are subject to the encoding and character restrictions for mail headers as described in [RFC822].

RFC822, while it says that most headers are character insensitive, does
not mandate that, and RFC 2919 only mandates that the List-Id: header is
subject to *encoding* and *character restrictions*, and does not say it
needs to adhere to case insensitivity.

Therefore, the proposed change above will bring things more in line with common
usage.
--VERIFIER NOTES--
Header field names are case insensitive per use of string literals from RFC 2234.

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