Notifying a user when (& why) you modify a post
You ever tried moderating anything?
With a policy like that you'll get one or two obsessives taking up 100% of your time arguing about tiny tiny details in your reasons. This'll take over your life. In about two nanoseconds after starting the job, as the nutters come out of the woodwork and try it on with the new face.
"No correspondence" is the only practical policy.