Warning, /pim/libksieve/src/ksievecore/scriptsparsing/autotests/data/delete-headers-with-index-ref.siv is written in an unsupported language. File is not indexed.

 <?xml version="1.0"?><script><action name="deleteheader"><tag>index</tag><num>1</num><test name="not"><tag>regex</tag><str type="quoted">Delivered-To</str><str type="quoted">bob@example.com</str></test></action><crlf/></script>