Here is what I would do in your situation: Create an email response template, or a couple, for these poor-quality support requests, perhaps outlining the most

Here is what I would do in your situation: Create an email response template, or a couple, for these poor-quality support requests, perhaps outlining the most common issues, and word it as peacefully and politely, plead, beg for the user to help improve product by providing more information about their issue. I would use this template liberally and tweak it with time. I would think of the people who write this type of query as being communicationally or socialy handicapped, and put in extra effort into trying to help them. Thank you for posting your question, it's a matter I've given much thought recently.