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RFC 5322, "Internet Message Format", October 2008

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

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Errata ID: 6639
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Brennan Vincent
Date Reported: 2021-07-12

Section 3.3 says:

   zone            =   (FWS ( "+" / "-" ) 4DIGIT) / obs-zone

It should say:

   zone            =   (FWS ( "+" / "-" ) 4DIGIT) / [FWS] obs-zone

Notes:

The current syntax does not allow space before an obs-zone. Thus, it rejects header items like:

Date: Mon, 12 Jul 2021 18:32:01 GMT

which are still being produced today by, for example, mail(1) on FreeBSD.

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