SignalWire.Relay.Messaging.MessageState

This is an enumeration that represents the different possible message states.

Value	Description
`delivered`	The message has been delivered. Due to the nature of SMS and MMS, receiving a `delivered` event is not guaranteed, even if the message is delivered successfully.
`failed`	The message delivery failed.
`initiated`	The message delivery has been started.
`queued`	The message has been put into the queue for delivery.
`sent`	The message has been sent for delivery.
`undelivered`	The message has not been delivered. Due to the nature of SMS and MMS, receiving an `undelivered` event is not guaranteed, even if the message fails to be delivered.