The other day I got a bill for some of my husband's medical expenses. I went to my banking site to pay, and it was the same odd amount I had paid two weeks before. Figuring it was a duplicate bill, I called the billing office. According to their records, my payment had not been received.
My bank account had proof of payment posted on my account, so I asked about the process to get this fixed. The billing person explained that I had to send a clear image of the front and back of the cancelled check.
I had a PDF including that, along with all the routing information and dates of the electronic transactions. Damn, good digital information can be fun!
Now for the punchline; I could email this, but only within the body of the email. NO ATTACHMENTS.
Yes, the medical center was losing it's stuff* over ransomware about this time and requiring all emails with attachments be quarantined. Apparently the billing department had been told to trust no PDFs from their clientele.
I ended up printing a PDF and faxing it. In May 2017.
Collection agencies have not called yet.