Outbound Queues

The durable outbound spool — de-identified objects awaiting forward, drained automatically. Retry-exhausted forwards move to Send Failures. Non-device software (FD&C Act §520(o)(1)(D))

Outbound Spool

De-identified objects sealed on receive and awaiting forward to the downstream. The drain forwards them continuously with retry/backoff; a healthy spool trends toward empty. A persistently growing spool means the downstream is unreachable — check the destination on Settings.
ReceivedSOP classSource AE AttemptsNext attemptSize

Send Failures

Forwards that exhausted their retry budget move off the spool to Send Failures, where you can re-send or purge them.