
When javascript is enabled/permited, it looks like this:

The code is really simple and could be easily automatically applied to pages (the code obfuscates even more, but that is irrelevant - see the original source for the code):
<script language='JavaScript' type='text/javascript'>
<!--
var prefix = 'ma' + 'il' + 'to';
var path = 'hr' + 'ef' + '=';
var addy35780 = 'g.martinez' + '@';
addy35780 = addy35780 + 'pcbsd' + '.' + 'es';
document.write( '<a ' + path + '\'' + prefix + ':' + addy35780 + '\'>' );
document.write( addy35780 );
document.write( '<\/a>' );
//-->\n </script><script language='JavaScript' type='text/javascript'>
<!--
document.write( '<span style=\'display: none;\'>' );
//-->
</script>This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
<script language='JavaScript' type='text/javascript'>
<!--
document.write( '</' );
document.write( 'span>' );
//-->
</script>
BTW, the PC-BSD site looks really nice, unlike Debian's.