Outbox
When you email a form to someone, a copy of the email stays in your Outbox until the email is processed by your recipient.
While in Outbox, an email can be recalled, viewed and tracked. Once a form leaves Outbox, it cannot be recalled.
The goal of Outbox is to provide you a quick overview of pending outbound messages.
Note:_ A form can be recalled only if the recipient has not opened it.