How are the PDF files named when downloaded? The name of the PDF files has the following structure: Date of receipt in the format year, month, day (YYYYMMDD) Sender (e.g. CAYA) Complete subject line Document ID (25 digits) Related articles In which file format does CAYA provide the digital letters? How can I set up automatic email forwarding? What do integrations cost? What is my CAYA Postbox address? How can I set up integrations?