complaintSubType
Can either be null or OnAccountSuppressionList. If the value is OnAccountSuppressionList, SES accepted the message, but didn't attempt to send it because it was on the account-level suppression list.
Can either be null or OnAccountSuppressionList. If the value is OnAccountSuppressionList, SES accepted the message, but didn't attempt to send it because it was on the account-level suppression list.