Some people don't understand that you can attach just an image file to an email. I often get Word attachments containing a single image.
Tangential to your comment but it reminded me.
I am genuinely curious. But then again, I ask the question as a computer enthusiast using a computer to talk to other computer enthusiasts about computers.
See also: https://successfulsoftware.net/2010/08/24/10-things-non-tech...