You can delay the delivery of a message for a specified time after you click Send.
*Note: Outlook must be online and connected for this feature to work.
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While composing a message, select the More options arrow from the Tags group in the Ribbon.
*If you don’t see these options, you probably have the simplified ribbon: On the ribbon, select the Options tab, then select the three dots, More commands > Delay Delivery.
Under Delivery options, select the Do not deliver before check box, and then choose the delivery date and time you want.
When you’re done composing your email message, click Send button.