A send client can send a message comprising multiple message segments to a receive client via a computer network. A data exchange server can receive the message segments sent by the send client and store these message segments in a storage device. The data exchange server can also send the message (once all the message segments are received) to a receive client. For each message segment to be sent to the receive client, the data exchange server can calculate a transmission rate for the message segment based upon current network throughput and send the message segment to the receive client at the calculated transmission rate.