Returns all recipients’ delivery and open statuses for a given message UID.
Response 200 OK
As email messages may take up to twenty-four hours to deliver or soft-fail,
the delivery status of each email is not finalized until it’s either
successfully delivered, or all attempts to do so have been exhausted.
As such it may be necessary to wait up to one day to get the final delivery
Response time is proportional to the number of recipients on a given message.
If polling this endpoint, we recommend syncing at most hourly.