Hacker News Reader

Besides Archive.org, there's also another reliable source for the second email: http://harmful.cat-v.org/software/andy_tanenbaum

You can also read the original USENET post on comp.os.research here: https://groups.google.com/d/msg/comp.os.research/fw2frykLjOI...

I've thought of using Google Groups too, but to my surprise I wasn't able to find the messages by searching for one of the email subjects.