Embodiments provide a delivery pacing solution to keep customers from affecting other customers. The delivery pacing solution need not be predefined or pre-configured for any customer or any particular job or job type and can be implemented in various ways, for instance, in a queue manager or a dynamic ticketing server. In some embodiments, an agent may obtain from a queue an item specifying a destination and determine whether the item has a concurrency parameter for a group associated with the destination. If so, the agent delivers the item to the destination. If not, the agent dynamically determines a concurrency parameter and returns the item to the queue with the concurrency parameter which controls a maximum number of items in the group that can be concurrently processed for delivery to the destination. A queue manager applies a concurrency rule to the item based on the concurrency parameter.