Delivery rates
Delivery rates
Max number of parallel deliveries to the same destination
Max number of recipients per message delivery
Initial concurrency level for delivery to the same destination
Max time (days) in queue before message is undeliverable
Min time (secs) between attempts to deliver a deferred message
Max time (secs) between attempts to deliver a deferred message
Time (secs) between scanning the deferred queue
Transports that should not be delivered
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