By &quot;things&quot; I assume you mean this stuff:<p>&gt; ARPA:   miw%uk.ac.man.cs.ux@cs.ucl.ac.uk
&gt; USENET: mcvax!ukc!man.cs.ux!miw
&gt; JANET:  miw@uk.ac.man.cs.ux<p>miw is clearly Mario Wolczko&#x27;s username.<p>Those will be his email address in different formats.  The first would route email to him at miw@uk.ac.man.cs.ux using cs.ucl.ac.uk first as a gateway.  The second address format is what&#x27;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.<p>You might find these references interesting:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Email_address" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Email_address</a>
<a href="http:&#x2F;&#x2F;www.faqs.org&#x2F;docs&#x2F;linux_network&#x2F;x-087-2-mail.address.html" rel="nofollow">http:&#x2F;&#x2F;www.faqs.org&#x2F;docs&#x2F;linux_network&#x2F;x-087-2-mail.address....</a>
<a href="http:&#x2F;&#x2F;www.livinginternet.com&#x2F;e&#x2F;ew_addr.htm" rel="nofollow">http:&#x2F;&#x2F;www.livinginternet.com&#x2F;e&#x2F;ew_addr.htm</a>