It encodes e-mail addresses using random mix of urlencode, HTML entities and then generates markup that's as tricky as possible, while remaining valid and parseable by browsers and XML-compliant parsers.
<a
class='email
href="mailto:x@y"
'
href
= '
 mailto:%20t%65s%74%40%74%65s%74%2ec%6fm?
'>test@t<!--
mailto:abuse@hotmail.com
</a>
-->­est.com</a>Test: test@test.com