# Flow Control

In some situations, message producers may send messages more rapidly than message consumers can receive them. The pending messages for a destination are stored by the server until they can be delivered, and the server can potentially exhaust its storage capacity if the message consumers do not receive messages quickly enough.

To avoid this, EMS allows you to control the flow of messages to a destination. Each destination can specify a target maximum size for storing pending messages. When the target is reached, EMS blocks message producers when new messages are sent. This effectively slows down message producers until the message consumers can receive the pending messages.

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