It is of the following Mime-Type:
Content-Type: application/vnd.apple.pkpass
Can I configure within the policy that certain Mime-Types can be passed / will be processed to other native Apple applications?
Remark: Apple Wallet is much better at handling tickets than a PDF reader / JPEG viewer. It parses date & time and you have always the right ticket right at the top. That is why customers keep asking this question. Currently they forward the email with the ticket to their personal email address and open it there with the native mail app. That is not a procedure I want to encourage.