mailto.php reclaims HTML mailto: links from spammers' e-mail address harvesters. Using JavaScript, it creates a link to an e-mail address while keeping the actual address obfuscated.
mailto.php turns this:
< a href="mailto:user@host.com">user@host.com< /a>
into
< script language="JavaScript"
type="text/javascript">eval(unescape('var addr %3
d '%6a%6f%64%72%65%6c%6c%40%
2573%70%6f%64%2e%75%6b%2e%6e
%65%74';var string = '%6a%%3
6f%64%72%65%6c%6c%40%73%70%%
36f%64%2e%75%6b%2e%6e%65%74'
;document.write('
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