09-15-2020 08:42 AM
09-15-2020 09:50 AM
No, as you cannot enforce things on sender's side. Perhaps you can use a web form instead, and configure the required fields there, then send a message based on the filled in form. Think of the "contact me" form on websites, etc.
Yes, but that still requires you to be able to control things on the sender side. I'm not saying it's not possible, I'm saying that you as the receiver cannot enforce this, unless having control on the sender side.