Turns out it’s possible to retroactively participate a thread that one hasn’t 
subscribed to. An example of it happening is here: 
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170206/031544.html
 
<https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170206/031544.html>

I wrote about steps to do it: 
http://dduan.net/2017/02/07/replying-to-old-mailing-list-threads/ 
<http://dduan.net/2017/02/07/replying-to-old-mailing-list-threads/>

I don’t think this fact and method adds to the strength to 
email-as-a-tool-for-discussion. But it does address a shortcoming that bothered 
me a lot previously.

> On Feb 6, 2017, at 7:18 PM, Daniel Duan <[email protected]> wrote:
> 
> My experiment results shows that email clients does more work to group email 
> threads than mailman. I’m going to write a blog post about how to participate 
> retroactively to mailing list discussions. Will keep you updated :)
> 
> 
>> On Feb 6, 2017, at 7:15 PM, Erica Sadun <[email protected]> wrote:
>> 
>> Ah, noted.
>> 
>> However both worked in my inbox
>> 
>> -- E
>> 
>>> On Feb 6, 2017, at 8:04 PM, Daniel Duan <[email protected]> wrote:
>>> 
>>> I only consider this one “worked” since mailman actually associated it 
>>> under the original thread on lists.swift.org. It seems the “In-Reply-To” 
>>> header is all the magic required!
>>> 
>>>> On Feb 6, 2017, at 6:47 PM, Daniel Duan <[email protected]> wrote:
>>>> 
>>>> Terribly sorry for spamming. This will be the last one.
>>>> 
>>>> I've added the `In-Reply-To` header to thunderbird and included the 
>>>> correct (hopefully!) value from a previous, on-thread message. This email 
>>>> address was not subscribed to the thread.
>>>> 
>>> 
>> 
> 

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