I’m sorry, this will be a little ranty.
We know there’s frequently a difference between acknowledging an email and answering an email, yes? “I’ll get back to you about that,” is not an end of an issue, in itself.
I have a few people in my work life with whom this is becoming a pattern. I send them something that ends in a question. A request for action on their parts. I get a very prompt “I’ll look at this first thing tomorrow,” and then crickets. For days.
The thing I love is that at this point, it can become a knock-knock joke.
Email. “I’ll look at this first thing tomorrow.” Follow-up email. “I’ll look at this first thing tomorrow.” Seemingly ad infinitum. I’d honestly prefer that you answer the email and skip the acknowledgment, if I have to choose. When I ask “Hey, did you get that email?” what I’m really saying is “Hey, were you going to answer my question, there, sometime soon?” It’s just a more polite way of saying it.
I get pretty cranky about seemingly pointless email, though, so maybe that’s just me. A former coworker complained because I don’t always start emails with “Hi” and a personal greeting and end with a formal closing. I admit that my approach to email can seem brusque, to someone who approaches it more formally, because I tend to view it from a more utilitarian, less formal perspective, especially among people who are sitting 15 feet from each other. I approach it more formally with people I don’t know well, but if we’ve chatted four times in a day and I know what you had for your last meal, I might start with “Hey, would you mind…” or a “Could you look into x when you get a chance?”
Okay, rant over. Now I’m going to remind the person again of the thing I’ve mentioned to them multiple times this week, and try to keep the edge out of my tone.