[exim] documentation advice

Hi all,

1) I'm working on some new exim documentation and have been trying to
decide on which domain names to use for:

- An example local domain
- An example domain(s) that I will relay/smarthost for
- An example external domain(s) that is not part of my mail system

I have read http://www.faqs.org/rfcs/rfc2606.html which offers me the 
following SLD's:
    example.com
         example.net
         example.org
but these don't seem distinct enough or unrelated enough and could 
easily be misread/misunderstood. And I really don't want to use 
subdomains of example.com as if they were separate and unassociated 
sites or organizations to example.com.

the other TLD options are:
               .test
               .example
               .invalid
               .localhost
which seem unfamiliar (because they are reserved, hence nobody ever sees 
them in day-to-day web browsing)

Has anybody done this before or know of any "generally accepted" ways of
doing this. I was previously using made up domains like "mydomain.com"
and "anothercompany.com" but these are risky as most are already
legitimately in use by other companies (not good if somebody follows the
examples to the letter)

2) IP addresses used in examples

RFC 1918 says:
    The Internet Assigned Numbers Authority (IANA) has reserved the
    following three blocks of the IP address space for private internets:

      10.0.0.0        -   10.255.255.255  (10/8 prefix)
      172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
      192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

When I used these example subnets in an example in reply to a question
on the list, somebody else on the list accused me of "violating the
RFC's" which was later re-phrased as "violating the spirit of the RFC's"
or "violating the RFC's in spirit"

I also looked at RFC 3927 (link-local addresses) which says:
    The non-forwarding rule means that hosts may assume that all
    169.254/16 destination addresses are "on-link" and directly
    reachable.

Again can anybody suggest sensible ranges which can be used safely in
examples instead of not giving an example or using something like :

some_value = {replace-with-the-real-ip-address-or-range-you-wish-to-use}

Thanks
Jason Meers

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