Statuses

Every message has an associated status. Once a message reaches a final status, no further actions will be taken with the message. The list of possible statuses is provided below:

Status	Direction	Type	Description
queued	outbound	intermediate	Message has been queued and will be sent according to account rate limit.
delivering	outbound	intermediate	Message has been sent and is awaiting final delivery status.
delivered	outbound	final	Message has been delivered.
failed	outbound	final	Message failed to be delivered.
unknown	outbound	final	Final delivery state is unknown.
expired	outbound	final	Message expired before being sent.
received	inbound	final	Inbound message received.