Public bug reported:

For high-traffic mailing list a lot of people prefer to register to the digest 
variant, getting one mail per day or week that includes all mails one after the 
other.
This digest stuff is defined as such and mail user agents may be able to handle 
it "properly", showing them not as one mail but as a folder of single mails, 
providing a means to reply to any single of them.

The drawback is that many mail user agents (e.g. Thunderbird without proper 
extensions, and - I guess - many web mail clients) don't handle these digest 
special.
As a result from that often a response for a mail is sent in fact as a response 
to the digest mail, listing the digests mail id in the In-Reply-To:-Header, 
which in turn breaks the proper threading view in mail clients.

For the openstreetmap.org-Mailinglists (as an example), the header of a
single mail in such a digest looks like this:

<blockquote>
Message: 1
Date: Mon, 15 Jul 2013 08:31:56 +0200
From: Max Mustermann <[email protected]>
To: [email protected]
Subject: Re: [Talk-de] someTopic
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi...
</blockquote>

As I wrote above: Using the reply-button in the MUA leads to a response
to the digest.

To respond (properly, with correct headers) to this mail, one would have to
- manually write a mail to talk-de@...
- add the header In-Reply-To: [email protected] (manually!?)
or
- initiate a reply to the digest
- change the In-Reply-To-Header to the right ID (changing from the digests 
message-ID to the one of the mail responding to)

There would be a third way, which I here propose as a solution: If mailman 
(e.g. by configuration) would add a Reply-Link to any mail section in a digest, 
it would be as easy to click there than to reply directly.
A reply-to-Link for the example above would look like

<a href="mailto:[email protected]?subject=someTopic&In-Reply-
[email protected]">Reply</a>

Of course Mail User Agents don't have to use all headers defined in the
mailto-Link, but it's possible, and at least with Thunderbird this works
fine.

** Affects: mailman
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1202548

Title:
  In-Reply-To from digest

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