Sinch Disable re-send failed message

According to Sinch document, a failure message will be sent again after 12 hours, and stored in the backend for 30 days to download after when clients online.

Note: Messages are persisted internally in the SDK. In case the message was not sent successfully it will be retried automatically at a later point in time. The message will be retried for 12 hours and then fail permanently firing the failure callback.

Note: Messages are stored in the backend for 30 days before being removed. If the recipient has not started the app and downloaded the message history within this time, the message will be lost and no notification received.

Now, I don't need my message store at Sinch server, and don't need re-send after 12 hours, if my message is sending fail, I want it gone away. How can I do that? I can't find any document related to what I need.