Hi,
Is I set: smtp_destination_concurrency_limit = 2 smtp_destination_rate_delay = 1s and send several messages to the same domain will each connection send one message and wait 1 second (so I would have 2 messages delivered per second, one from each connection) or both connections to the same destination domain coordinate themselves and I would have only one message delivered per second to the destination domain? Regards, Rodrigo Severo