441031 - comment text in In-Reply-To breaks threading

Status: RESOLVED DUPLICATE of bug 180299

(Thunderbird :: Mail Window Front End, defect)

Description

[bob o`bob]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Build Identifier: 2.0.0.14 (20080421)

some mail clients insert extra data in headers, such as:

In-reply-to: Message of "Sat, 21 Jun 2008 06:21:12 PDT."
             <[e-mail]> 

Even though the message with the supplied message-id appears in the same folder, this message does NOT get threaded to it.

Reproducible: Always

Steps to Reproduce:
1. find someone with a MUA which inserts this or other extraneous info
2. attempt a threaded conversation
3. Happens (to me) every time

Comment 1

[Joshua Cranmer [:jcranmer]]

A) That's not a comment in terms of MIME syntax; the proper definition in the ABNF is "phrase".
B) The production of such In-Reply-To headers is obsolete per rfc 2822, §4.5.4 and §3.6.4, but we can't fix the MUA here (there are worse MUAs, though, that fail to even provide an In-Reply-To header).

Anyways, quicksearch leads me to a small list of five, one of which is bug 180299.