The Ontario Governement emailed us Vaccination Receipts shortly after we were vaccinated. As of Sept 22, we will need to show them some places if we want access. When I go back to that email, I find that it is defective. You cannot read the PDF from my MUA (Alpine on Linux), and I suspect that this is true for any Linux or UNIX MUA. Perhaps also for Apple MUAs. The reason is that the PDF is sent as an attachment, with the wrong type specified in the attachment's headers: Content-Transfer-Encoding: base64 Content-Type: text/plain;charset=utf-8 Content-Disposition: attachment;filename=Dose_Admin_...pdf" On POSIX systems, attachments with Content-Type "text", have CR LF sequences replaced by NL. I was able to make it work by manually editing my mailbox, changing the Content-Type header to: Content-Type: application/pdf