Some of the examples have been "sanitised", i.e. certain words have been changed, and some user-names and domain-names have also been changed.

six

s i x

s.i.x

s-i-x

s
i
x

char	/	:	@		u	w
%code	%2F	%3A	%40		%75	%77

e.g. http://%77%77w.ab%67e%61n%69m%61l%73.co%6d/

e.g.: <html>
<body> <font color="#ffffff">trousers Grommit cheese ...etc...
<a href="http://www.yahoo.com/some/page/in/a/very/long/URL/that/goes/on/and/on/*http://www.badguys.com/nastypage/"> <img border="0" src="http://www.yahoo.com/some/page/in/a/very/long/URL/that/goes/on/and/on/*http://www.badguys.com/someimage.gif"> </a>
Wensleydale mp3 guitar ...etc...
The spam's message is all in the remote image and even its URL is somewhat disguised for a browser's "benefit": src="http://www.yahoo.com/some/page/in/a/very/long/URL/that/goes/on/and/on/*http://www.badguys.com/someimage.gif". The many innocuous words, invisible if the background is whiteish, will deceive any(?) word-counter. The spam-generator can easily change them at random from spam to spam; every spam can be different.

remove	remov', rem've, re move, re-move, re_move, rem0ve, etc., unsubscribe, un subscribe, un-subscribe, unsubscr1be, unsub, etc., optout, opt-out, opt_out, opt out, etc., no more, no-more, no_more, n0more, nom0re, etc., etc.
click	c1ick, c!ick, cl!ck, cl1ck, c11ck, clik, clic, klic, klik, c1ik, c!ik, etc., press, etc., etc.

and this is not even trying.

Now you see it

now the mail server doesn't

-- L.A.