check witch of these methods helps you

Disable Automatic Replies. If you set a date range for your automatic replies, the assistant will end automatically when the date range is over. If you didn’t set a range, it will continue until you open the Automatic Replies menu and select “Do not send automatic replies.”

Disable Out of Office Assistant. If you set a date range for your automatic replies, the assistant will end automatically when the date range is over. If you didn’t set a range, it will continue until you open the Automatic Replies menu and select “Do not send Out of Office auto-replies.”

Disable the rule. When you have returned to the office, you can disable the rule by opening the Rules and Alerts menu again. Select the Out of Office rule that you created from your list of active rules, and then click the Delete button.