A standard OOO responder email simply needs to inform the sender that you are out of the office and when to expect a response. Like this: Hi there, Thank you for your email. I am currently out of the office until [date] and will have limited access to my email. If you require immediate assistance for any urgent matters, please contact [name] at [email] or [phone] in my absence. Best,
I used to work with someone who had a message telling people she only checked her email twice a day. You pretty much needed to call her if you needed anything outside of those times. (She worked in a remote office.) I think she had read one of those books on efficiency that recommended scheduled email time. But there were problems with this: 4. My department often had to email attachments or text to illustrate our questions/concerns. And we were on deadlines. Reading a page of text over the phone was not an efficient use of anyone’s time 5. She did outreach & was often out of the office on site visits, trainings, or travel to these places, but never ever set her OOO for these, because she was “working.” However, she was effectively not available to read emails from other staff until after hours on those days.

iOS is offering a feature to set an autoreply for all incoming calls. Instead of merely rejecting the calls, you can send back pre-set messages while you reject it. You have an option to set three quick response message to send back while rejecting the incoming calls.
I worked in a call center for Big-Evil-Bank for five years, and every new manager would have a different OOO policy/pet peeve that they would require phone-miners to follow. In particular, the memory of the six month period where we were forced to put an OOO up if we left our desk for so much as ONE HOUR smacked me in the face when I saw question. That was by far the worst/strangest/most tedious OOO policy I have ever been forced to follow.