info.mailtraq.com > Outgoing Mail > Message Throttling Message ThrottlingMessage Throttling enables the management of outbound message delivery. 
Throttling is defined as "x successful recipient delivery attempts per y seconds" on a per-route basis with a reset to zero on y second intervals, normalized in the Console to a number per hour. This means that if x = 1000 and y = 3600 then you might deliver 1000 messages within the first few minutes every hour and then none for the rest of the hour, rather than dribbling them out at a constant rate. Throttling is on a "per recipient" basis not a "per message" basis as the router operates on the recipient level. Multiple recipients may have differing routes for the same message and the decision is on a per-route basis. Operation The throttle is only available if the [x] Enable Advanced Outbound Router In normal operation the throttle is only set on selected routes. | 
