"Thank you for your email. I will be out of my office today INSERT DATE from INSERT TIME FRAME FOR WALKTHROUGH walking classrooms at my school. I will not be responding to any emails during this time. I will be back at my desk on INSERT TIME WHEN YOU WILL BE BACK AT DESK and will respond to your email as soon as possible. I will likely have a backlog, so I appreciate your patience.
If this is an emergency you can contact me/my school office at PHONE NUMBER. "