I'm sorry, that's just not good enough. I used to be a programmer, there is always a way to get things done. How can you say its not possible? Set a flag in the database to say that an email has already gone out, so don't resend? Something? Can you explain why its not possible?
So do I now have to hire a developer to get this working properly? Or maybe I have to learn php for myself.
As I said earlier, it is a blocker issue for us and we are really trying our best to solve this. WooCommerce does not have multi-seller feature. So the mails ARE going through WooCommerce and getting scrambled. We are trying hard to stack the mails into one.
You may have a look at the mailing function of WooCommerce and suggest us a better solution.