If I can exfiltrate your email with something that responds in that way, what other information can I pull from your system, without your intervention?

If I made it send something, I probably made it make a tool call. What other tools can I make it call?

I'm afraid this isn't a shrug - it's a zero-click vulnerability. It might be the start of a chain to RCE. It doesn't have to work every time, either. Just enough of the time.