This is probably a very long shot. I was part of quite a few maling lists / email groups back in the 1990s in Brazil. Lists for things like writing, The X-Files, Star Trek, or skepticism. I made a few friends. I know some of them were probably hosted on large foreign companies like Yahoo. I don't remember the actual names of the lists, and the internet provider where I had my email no longer exists. So I don't expect to find them easily, but I imagine that there must be some kind of archive where they may or may not exist. I'm okay with sifting through for a very long time if I have to. That may be facilitated by the fact that the Brazilian internet was fairly small back then. And I do remember possible usernames I might have used at the time, which I can use in a search.

Is what I want possible at all? Is there some kind of centralized archive that is easy for me to use?

Thanks!