My personal policy is not to do it unless someone asks for it. I think it’s an ok way to go about things most of the time. If I have ”skin in the game” with tha

My personal policy is not to do it unless someone asks for it. I think it’s an ok way to go about things most of the time. If I have ”skin in the game” with that text and it’s important, I try to nicely ask for a permission to edit things. In my experience nothing pisses any person, including myself more than when someone starts editing my stuff and possibly even changes the meaning of things as they go. Way in the past I remember the absolute most deadly feelings I got when an actual editor for the first time jumped and killed half of my text before I had done any of my own edits on some website copy. Writing is highly personal, and others, especially in a basic email, might consider you just excessively nitpicky while focusing on all but the relevant stuff at hand. The worst thing that the person gets when writing wrong or excessively or whatever is that they will be misunderstood. Eventually it will come back to them in one way or another and they’ll improve and it’s their problem. If someone asks or you ask nicely on the other hand, that’s the way to go, is respectful, friendly and appropriate. Just be careful that they don’t start to keep coming to you with grammar checks :-D