It seems that Mail.app (and I suspect most “desktop class” clients) can display arbitrary headers. This includes the key “Message-Id” and “In-Reply-To”. So as long as an email client supports adding “In-Reply-To” (not to be confused with “Reply-To”) during composition of an new email, one can use it to retroactively participate a mailman-hosted thread. (the value to use can be found in the mailto: address from the web archive. Too bad Mail.app does’t support this. The internet claims Thunderbird can do this: http://www.pixelbeat.org/docs/thunderbird-threading.html
> On Feb 6, 2017, at 6:01 PM, Erica Sadun <[email protected]> wrote: > > And then I thought to myself "Maybe if I reply to daniel+test, you won't see > this". Resending to your normal addy. > > >> On Feb 6, 2017, at 7:00 PM, Erica Sadun <[email protected] >> <mailto:[email protected]>> wrote: >> >> Replying off-list. Worked fine. Appeared right in-thread. >> >> -- E >> >> >>> On Feb 6, 2017, at 6:57 PM, Daniel Duan <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Here’s my attempt to chime in an existing thread from a newly subscribed >>> email address. >>> >>> > This may help >>> > >>> > http://webapps.stackexchange.com/questions/23197/reply-to-mailman-archived-message >>> > >>> > <http://webapps.stackexchange.com/questions/23197/reply-to-mailman-archived-message> >
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