Have you ever written an email and clicked the send button only to wish you had given it just another minute or two of thought? Of course, you can always attempt to do a message recall; however, if your recipient has rules turned on to route your messages, they're going to get it anyway. Also, if you're sending to clients who do not honor that request, you're going to be out of luck. So, how can I configure Outlook to save me from myself?
You will notice that the message is queued for delivery in your Outbox. In approximately 2 minutes (or whatever setting you chose), the email will be delivered and cleared from your Outbox. However, if during that time you decide you want to retract that email, it's a lot easier (and safer) to simply delete it from the Outbox than it is to rely upon everything between you and intended recipient to clean it up for you.