OOB EMAIl API (POST) is no longer working without admin id.

[Kartik Choumal]

Post Vancouver upgrade the OOB EMAIL API is no longer able to POST the email if I am not using a admin account.

Error:

{
  "error": {
    "message": "Operation Failed",
    "detail": "ACL Exception. Send Failed due to security constraints"
  },
  "status": "failure"
}