Normal servers only send mail from their own users to anyone else.
According to the protocol, before the connection is closed, the server should send a full-stop on a line by itself.
The server looks at those, chooses among them, and sends them back.
When something notable happens to a particular user, the server sends a message about that event down to the phone in question.
When it is back up running again, our servers will connect and send all the waiting good messages.
The server sends game and agent state information to each agent.
The server sends the requested digital data to the user's television or other monitor.
The server provides the connections and sends pages of information back to the game client.
The server sends required information to the kitchen in real time.
The remote server sends a response to the client, and the application continues its process.