Possible states for a message to exist in.
iscmessageservice_v3 (in iscmessageservice_v3.dll) Version: 126.96.36.199
Isc.MessageState = function();
Message has been accepted by the server, and is awaiting transmission.
Message has been transmitted successfully.
Message was accepted by the server, but could not be transmitted to all recipients.
Message was not accepted by the server, due to bad input from client.
Could not locate any messages matching this identifier and sender.