[rwh86]

By "things" I assume you mean this stuff:

> ARPA: [e-mail] > USENET: mcvax!ukc!man.cs.ux!miw > JANET: [e-mail]

miw is clearly Mario Wolczko's username.

Those will be his email address in different formats. The first would route email to him at [e-mail] using cs.ucl.ac.uk first as a gateway. The second address format is what's called a bang path, for UUCP email. The final one is a modern IETF standard email address. JANET is a network provider for UK academic institutions, similar to an ISP but structured differently.

You might find these references interesting:

https://en.wikipedia.org/wiki/Email_address http://www.faqs.org/docs/linux_network/x-087-2-mail.address.... http://www.livinginternet.com/e/ew_addr.htm

[pm215]

I think that last one isn't a modern standard email address -- the domain part is reversed. It's a JANET NRS path (https://en.m.wikipedia.org/wiki/JANET_NRS). The modern equivalent would be [e-mail].

The first email address (the ARPA one) is presumably using a machine in UCL as the gateway between internet routing and JANET routing, since the part before the % is the JANET NRS component ordering. The obvious conclusion would be that the mail server he was using didn't have an ARPAnet connection at all.