Schedule a message to send later in Outlook
Draft. Not published yet.
Write the message as usual, then tell Outlook when to send it. The steps differ in new Outlook and classic Outlook.
New Outlook, Outlook on the web, and Outlook.com: While composing, select the arrow next to Send, then Schedule send. Pick one of the suggested times or a custom time, then select Send. The message stays in Drafts until that time. Microsoft notes this isn’t available for IMAP or POP accounts.
To send it immediately instead, open the message from Drafts, choose Cancel send, then Send.
Classic Outlook: While composing, open message options from the Tags group, or go to the Options tab and choose More commands if you use the simplified ribbon. Under Delivery options, check Do not deliver before, set the date and time, and close the dialog. Then select Send. The message waits in the Outbox. Classic Outlook needs to stay online and connected for delivery to happen.
To send it now, open the message from the Outbox, clear Do not deliver before, close the dialog, and select Send.