In Microsoft Outlook, you can specify a delivery time for every message you send.

Schedule Emails in Outlook

To set a date and time before which a message must not be sent in Outlook:

1. Start with a new message, reply or message.
2. In Outlook 2007 to Outlook 2016:
   1. Go to the message's Options tab.
   2. Click the expansion button in the More Options field's lower right corner.
      • You can also click Delay Delivery in the More Options area if you see it.

1. In Outlook 2000 to Outlook 2003:
   1. Select View | Options from the message's menu.
2. Make sure Do not deliver before is checked under Delivery options.
3. Select the desired delivery date and time using the drop-down lists.
4. Click Close.
5. Continue composing the message and eventually click Send.
   • This, of course, will not actually have the message delivered until the set date and time are reached; until then, the message is in the account's Outbox folder.

What Happens in Outlook When the Delivery Time Is Reached?

As soon as the time you have set for delivery is reached, Outlook will initiate delivery of the message from the Outbox folder.

It is as if you had kept the message open and clicked Send right then. Other than in the email's text—you obviously not knowing about something that happened after you wrote the message—, there will be no trace of your clicking Send earlier than that time.

What Happens if Outlook Is Not Running at the Delivery Time?

If Outlook is not open and running at the time a message reaches its do-not-deliver-before time, that message will not be delivered at the specified time.

Outlook will send the message immediately the next time you launch it. It will be as if you clicked Send right when you started Outlook.

What Happens If There Is No Internet Connection at the Delivery Time?

If you are not connected to the net at the time of scheduled delivery, Outlook will try to but fail to deliver the email at the specified time.

You will see a Outlook Send/Receive Progress error window.

You can use the Send All command (on the Send/Receive ribbon) to manually re-initiate transfer. Outlook will also automatically try to send again, though. The message will appear to be sent when Outlook actually can deliver it.

Note that the same is true if Outlook is set to working offline at the scheduled time of delivery. Outlook will then automatically send as soon as the account used for the message is working online again.

Can I Edit a Scheduled Message or Change Its Delivery Time, Send Immediately?

Before a scheduled message is delivered by Outlook, it sits in the Outbox folder for the account used to send it.

To edit a scheduled email or change its delivery time:

1. Go to the Outbox folder for the account that you used to compose the message.
2. Find and double-click the email you want to edit.
3. Edit the message as you see fit.
   • To change the time for scheduled delivery:
     1. Go to the Options ribbon.
     2. Click Delay Delivery in the More Options area.
     3. Edit the time under Do not deliver before.
     4. Click Close.
   • To deliver an email immediately:
     1. Open the Options ribbon.
     2. Click Delay Delivery.
     3. Make sure Do not deliver before is not checked.
     4. Click Close.
4. Click Send.

Schedule More Flexibly, Recurring Emails and Attachments in Outlook

To schedule messages more flexibly and include automatic attachments, too, you can try a number of specific Outlook email scheduling add-ons or resort to a email scheduling service.

(Updated March 2016, tested with Outlook 2016)

https://www.lifewire.com/schedule-emails-in-outlook-1173683