I would find getting an auto-reply for every email I send to someone, just telling me they won't be looking at it until later that day ~incredibly~ frustrating.

I would find getting an auto-reply for every email I send to someone, just telling me they won't be looking at it until later that day ~incredibly~ frustrating. I do not need that email on my phone. I do not need that email in my box. Perhaps a rapportive like sidebar, but not as an email proper, please.