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RFC 5322, "Internet Message Format", October 2008

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

Errata ID: 3979
Status: Verified
Type: Technical

Reported By: Peter Occil
Date Reported: 2014-04-30
Verifier Name: Pete Resnick
Date Verified: 2014-04-30

Section 3.6.7; 4.5.7 says:

received        =   "Received:" *received-token ";" date-time CRLF

obs-received    =   "Received" *WSP ":" *received-token CRLF

It should say:

received        =   "Received:" [1*received-token / CFWS]
                      ";" date-time CRLF

obs-received    =   "Received" *WSP ":" [1*received-token / CFWS] CRLF

Notes:

"The 'Received:' field contains a (possibly empty) list of tokens followed by a semicolon and a date-time specification." As it was originally written, though, whitespace and comments are disallowed right after the colon if the list of tokens is empty: for example, the header field "Received: ; Wed, 30 Apr 2014 00:00:00 -0000\r\n" (with a space after the first colon) would be invalid according to the current spec; only "Received:; Wed, 30 Apr 2014 00:00:00 -0000\r\n" (without a space) would be.

Verifier note: The erratum is clearly correct. There are other possible ABNF solutions, but the one above is sufficient to fix the problem.

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