Create a new message with optional file attachments
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REMINDER, PAYMENT_PLAN_RMNDR, OVERRIDE, FOLLOW_UP, EXPIRED, CONFIRMATION, INTRODUCTORY, CANCELLED, UPDATE Successful Response
CREATED, QUEUED, SCHEDULED, SENDING, SENT, UNDELIVERED, DELIVERED, READ, FAILED, EXPIRED, OPTED_OUT REMINDER, PAYMENT_PLAN_RMNDR, OVERRIDE, FOLLOW_UP, EXPIRED, CONFIRMATION, INTRODUCTORY, CANCELLED, UPDATE