If it isn’t the first email you’ve ever exchanged, why can’t you just plan for the fact that they got your email and if they drop the ball the fault is not yours?

“I’m sending you this thing, if anything is wrong please let me know; otherwise I will assume all is agreed and we can move forward.”

No response required. Stay off my lawn, don’t send me an email or a text or anything else that just says “ok”. Maybe I’m showing my age…