Better ideas?
Since validating and responding haven't been working... .probably good to try something else... like not responding.
I get it you want to be sincere... .so... try this. Modify as you see fit... .my goal is to give you the gist of something.
"Since I'm having trouble imagining a helpful response to your email, I'm going to take a break from reading and responding. I'll check in with you tomorrow afternoon. "
FF