Petzold's defence lawyer Ian McKay then had a chance to cross-examine.
He asked Yee about the email “headers” — metadata contained in the digital file that is not typically seen by the end user unless they specifically go looking for it.
The email headers read, in part: "Received: From Emkei.CZ".
That website, based in the Czech Republic, describes itself as a "free online fake mailer” and allows users to send emails that can appear to come from any sender.