How to delay delivery of an email

As far as I know, Mail does not have this feature; the closest thing to it would be to save your email in the Drafts folder and create a note for yourself with the day/time you want to send it. A Drafts folder will be created automatically as soon as you choose to save the message as a draft. Once ready, simply open the email in the Drafts folder and select Send in the message menu.

I believe you can get Outlook for OS X by way of MS Office. It should have most if not all the same features as the Windows edition.