That's not how FOIA works. It's a good thing too. Government employees almost always fight FOIA requests. There aren't many subjective tools (e.g. overbroad) and you're certainly not required to say why you're making the request.

Data privacy laws in the US are unfortunately minimal. The bigger problem comes from imbalance -- if the government and corporations have lists of names, people need them to in order to be able to work together and organize.

If you don't think this information should go out in FOIA requests, the tool to accomplish that is data destruction. Government could wipe old emails once no longer relevant.