So, if you have a Mac and can do it there, that’s the preferred method because you can apply it to all of your email accounts. While it’s easy to create an automatic reply in the Mail app on iOS, it will only work with certain types of email accounts.
How to set up an out of office in Apple Mail on iOS Mark the box next to your automatic reply rule to start using it. And remember, when you return from your trip, just pop back into that same section and uncheck the box next to your rule. When you are ready to head out and want to begin using your out of office message, just go back to the Mail Rules and check the box next to the rule you created. Click Don’t Apply for the rule and your selected emails. Click Don’t Apply because you only want to use the automatic reply once you are away and not for currently selected emails. You will then receive a prompt asking if you would like to apply this rule to the selected messages in your inbox.
So, open the Mail app and then follow these steps. To get started with your automatic reply on Mac, you’ll be setting up a rule.
How to set up an out of office in Apple Mail on Mac