[codingdave]

I don't see this as a problem - getting a message just right does take significant time and effort. While you cannot spend 5 hours on every email for every support request, you can spend that much the first time you communicate a specific message.

Focus on categorizing the emails you have sent, noting which ones get a positive response and which do not, and using the positive prior emails as templates for future emails. You'll still spend the right effort on messaging, while re-using your prior work so you speed up over time.