On a sort-of-related note, the domain you've chosen is valid, which
probably wasn't your intention. Unknown.com sounds made up, but it's
real.
As you know and as you do, but Ken Blake does not do and might not know,
the correct way to make an invalid domain is to let the top level domain
(the part of the address after the last dot, such as com, net, or uk) be
the string "invalid" (no quotes, of course), such as what I use,
(e-mail address removed).
If one does that, it doesn't matter what the other parts of the address
are, the address is guaranteed to be invalid, and will not impinge by
accident or otherwise on a valid domain.
You could even hide a correct domain name that way, for instance, if Ken
Blake used (e-mail address removed) instead of
(e-mail address removed), where for the sake of illustration I am
pretending that his correct address is (e-mail address removed) (which, by the
way, is a *possible* legitimate address, as is
(e-mail address removed)).