Well, this is Javascript, but interesting:
http://www.albionresearch.com/misc/obfuscator.php
Link description:
"Sadly there are a number of 'spambots' which roam the web 'harvesting'
email addresses to send spam to. Often you have no choice but to
include an email address in a web page. Fortunately most of these
spambots do not seem to have complete HTML parsers. This free Email
Address Obfuscator generates a 'mailto:' link which will confuse naïve
robots, but will still work in standard browsers."
Looks like the above page has some helpful links to other sites on
subject at bottom of page.
Hth,
M
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