never_retry — whether or not to retry delivery of failed messages
never_retry = false
Whether or not to retry delivery of failed messages. If it is set to true, then instead of re-queuing the message, the message is failed with: "554 5.4.7 [internal] exceeded max retries without delivery".
The default value for this option is
never_retry is valid in the global, domain, binding and binding_group scopes.