Doesn't any personal info entail they customized the letter, and therefore it isn't a form? Or are you just accounting for the fact that sometimes an author can't tell?
That can be automated. Especially places that have an automated submission system. It can take specific fields (Ms. Carpenter, "Damsel") and put them into a form letter. (Dear Ms. Carpenter, Thank you for submitting your story "Damsel" to us. Blahblahblah.) So, unless there is something detailed in the response (We especially liked the way she melts the dragon at the end, but unfortunately the story didn't hold together for us.) it's probably not personal.