A send client can send a message or multiple segments of a message to a receive client via a computer network. A data exchange server can receive the message and store the message in a storage device. If the send client sent the message in multiple segments, the data exchange server can store the message segments in the storage device once it receives all the message segments. The data exchange server can send the message in multiple segments to a receive client. The data exchange server can send a send receipt to the send client upon sending the message to a next destination. The data exchange server can send a receive receipt to the send client upon receiving the message. The data exchange server can send messages of an ordered set in the order in which they are received from a send client.