I sent an e-mail with an attachment and was apparently hectic, at least overlooked the fact that it wasn't ready when I packed the laptop. Now I'm wondering what date the email will be. The output shows when I clicked submit. But is this also transmitted?
The date from when it was actually sent out and is no longer in the outbox.
So my experience.
As a rule, the outbox is like a clipboard.
The date when the email was sent.