Returns a Boolean value that indicates if a message has been sent. True if sent, False if not sent. Read-only.
In general, there are three different kinds of messages: sent, posted, and saved. Sent messages are traditional e-mail messages or meeting items sent to a recipient or public folder. Posted messages are created in a public folder. Saved messages are created and saved without either sending or posting.
expression.Sent
expression Required. An expression that returns a MeetingItem or MailItem object.