(not exactly sure if this is the right place for this question, but I trust you will migrate it if it isn't)

I was having a problem with gdb, and while there issue appears to be recurring, I found only one instance of someone recently experiencing the same problem. I found this other instance on a mailman archived mailing list.

Then I tried some more things and finally solved the issue with gdb. So, now I want to report back the solution I found to the mailing list. However, this is really only of use if mailman recognizes my mail as being the same thread as the original problem, but I do not have that mail (just the online archived version of it) so I cannot reply to it.

My question: How can I make sure mailman considers my mail as a reply to that thread? Is simply copying the topic enough?