Use rules to create an out of office message - Microsoft Support
https://support.microsoft.com/en-us/office/use-rules-to-create-an-out-of-office-message-9f124e4a-749e-4288-a266-2d009686b403
WebCreate an out-of-office rule. On the File tab, select Manage Rules & Alerts. In the Rules and Alerts dialog box, on the E-mail Rules tab, select New Rule. Under Start from a blank rule, click Apply rule on messages I receive and click Next.
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