Yes.
Let's take the easy one, the XMCA archive from September 1995 and on (with
a hole for first half of -97):
http://communication.ucsd.edu/MCA/Mail/Discussion_archive.html
a Hypermail thing which is subdivided by month and gives an overview of
subject lines with links into individual message.
Quickly looking for something I knew would be there I found a discussion of
semiotics (&Peirce) by Lang and others in the end of January -96... but
there will be more if you browse, I'm sure
Eva