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Frank Reed wrote:
> Specifically for Paul Hirose and maybe Marcel Tschudin, the messages you are 
receiving now have the "In-Reply-To" header. Has that helped the 
grouping/threading functions in your email reader?

No. The headers are present, but have no effect. The problem seems to be
that the reply's References and In-Reply-To do not match the Message-ID
of the parent message. Unable to find a parent, Thunderbird defaults to
listing the child among unrelated messages.

For example, below are headers from a chain of replies between two
people. (I have deleted some data for privacy.)

In-Reply-To: 
References: 
Precedence: list
Mailing-list: list NavList [at deleted]; contact Frank [at deleted]
List-id: NavList 
List-post: , 
List-help: 
List-archive: 
Errors-to: 
List-: 
MIME-Version: 1.0
From: "Alexandre Eremenko" 
Sender: NavList [at deleted]
To: cfuhb-acdgw [at deleted]
Reply-To: NavList [at deleted]
Date: 21 Jan 2013 20:40:56 -0800
Subject: [NavList 22060] Jupiter and the Moon observation
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Message-ID: 
X-OriginalArrivalTime: 22 Jan 2013 04:40:56.0541 (UTC)


Based on the message body (not shown here), the following by Antoine is
clearly a reply. However, the headers don't refer to the message above.
(For brevity, many headers omitted.)

In-Reply-To: 
References: 
From: "=?utf-8?Q?Antoine Cou=C3=ABtte?="

Date: 22 Jan 2013 00:35:00 -0800
Subject: [NavList 22062] Re: Jupiter and the Moon observation
Message-ID: 


Alexandre replies to the above, and again the IDs don't match:

In-Reply-To: 
References: 
From: "Alexandre Eremenko" 
Date: 22 Jan 2013 05:37:51 -0800
Subject: [NavList 22064] Re: Jupiter and the Moon observation, correction
Message-ID: 


And Antoine's reply:

In-Reply-To:

References: 
From: "=?utf-8?Q?Antoine Cou=C3=ABtte?="

Date: 22 Jan 2013 07:42:33 -0800
Subject: [NavList 22066] Re: Jupiter and the Moon observation, correction
Message-ID: 


In each case, In-Reply-To is different from the Message-ID to which the
message replies, though it's obvious from the message body that it
really is a reply.

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