Nope, this is not possible at all. There is no provision for it in the mailto:
protocol, and it would be a gaping security hole if it were possible.
The best idea to send a file, but have the client send the E-Mail that I can think of is:
- Have the user choose a file
- Upload the file to a server
- Have the server return a random file name after upload
- Build a
mailto:
link that contains the URL to the uploaded file in the message body
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