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I use Thunderbird's threaded view of email messages to group emails together which are related. However, sometimes people will reply to messages using some mail program which does not properly set the headers to tell it's a reply, or will even write a new mail instead of replying.

In these cases I would like to manually assign or "dock" a mail to an existing thread. Is there some way / addon to do this in Thunderbird?

I'm thinking along the lines of a context menu "attach mail to thread XXX". The mail would then become part of that thread (maybe with a special marker explaining that it was manually grouped).

Update: I'm using Thunderbird 3.7 Alpha, but I'm interested in solutions for any version.

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The feature request for this is over at getsatisfaction.com/mozilla_messaging/topics/… . Please go and +1 it! :) –  colan Sep 20 '13 at 15:34
    
And the actual ticket for this is over at bugzilla.mozilla.org/show_bug.cgi?id=36024 . –  colan Sep 20 '13 at 15:43
    
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3 Answers

up vote 4 down vote accepted
+100

The only solution I can think of is to change the subject-line so that the email would fit into Thunderbird's thread-model (Re: subject). There are two way I can think of:

  1. Forward the email to yourself with a new subject-line.

  2. Use the TB Header Tools Extension to edit the subject-line. However, I have no experience with this extension and cannot guarantee that it works. Apparently, it used to work pretty well with TB2.

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Thanks for the pointer to the Header Tools Extension. Apparently it really does not work for TB 3, but it might give me an idea. –  sleske Apr 12 '10 at 10:44
    
I have Thunderbird gouping messages with DIFFERENT subject lines: superuser.com/questions/649767/… –  That Brazilian Guy Sep 24 '13 at 17:58
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Yes, Thunderbird has evolved since 2010. –  harrymc Sep 24 '13 at 18:33
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harrymc's answer pointed me to a review post for the TB Header Tools Extension, which says:

However, I have discovered that TB3 now DOES allow the email to be dragged onto the desktop, edited with Notepad, and dragged back, so that's my preferred way now.

This is probably what I'll do as well. That way I can change/add headers as I see fit (either adjust the subject, or directly add the missing In-Reply-To: or References: header.

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@sleske: Since you've added your own answer, we now certainly have a problem with the bounty. This is why the poster is always encouraged to edit his post, rather than adding answers, if there's a bounty or not. –  harrymc Apr 12 '10 at 20:09
    
@harrymc: Sorry, didn't know that. Where is the problem? I can just accept an answer, can't I? –  sleske Apr 12 '10 at 23:35
    
Righty-o, that's one way to solve the problem. However, my answer is not the one that you'll use :) –  harrymc Apr 13 '10 at 20:20
    
@harrymc: Well, no, not directly, but you did point me into an interesting direction. At any rate, there is definitely no better answer than yours ;-). –  sleske Apr 13 '10 at 22:22
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Please check a good info on threading here: https://github.com/protz/GMail-Conversation-View/wiki/What-is-threading

Main reason for unwanted behaviour?:


Unrelated threads are grouped together!

Someone was lazy, and instead of composing a new message, just hit "Reply All", and changed the subject. You need to educate these people and tell them not to use reply all when they intend to start a new thread.


I'm still wondering whether there is a way to manually change the reply-to or references headers.

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Yes, there is a way to manually change the reply-to headers. See my answer :-). –  sleske Oct 13 '11 at 12:48
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