Status for sending to a particular recipient.
3: Blocked because of nomailing flag
5: Bounce received from transport channel
7: Test recipient, will be deleted after sent
10: Recipient sent a complaint
2: Blocked because it duplicates another shipment addr in the same batch
9: Recipient does not have subscription for shipmentType
6: Recipient has opened the message, we know because of tracking
1: Ready for shipment.
8: Vacation notice, etc
11: Recipient address has bounced too many times
0: Default value for empty rows.