In my Outlook Add In I want to implement a callback function that works without Exchange Server. For this purpose all mails, when they are sent, should be moved to the mail outbox for a time selected by the user and only then be sent. In the time the mails are in the outbox, the sending process can be cancelled by the user moving the mail to another folder.
Unfortunately I have no idea how to implement this. But I need the add in for a university project. Can someone help?