The present invention discloses a method of message transmission performed in a server; a method of message transmission performed in a client; a symbol-based method for transmitting a message between a server and at least one client as well as a server; a client and a symbol-based message transmission system, wherein the symbol-based method of message transmission has: at least one client requesting the server to perform message transmission; the server transmitting symbols of the client's message to the client; and presenting the received message symbols on the client. The symbol-based method of message transmission saves a great deal of bandwidth of the communication channel by having the server only transmit symbols that represent the message after receiving a message transmission request from the client. This is done in order to efficiently transmit a message with a large body and/or attachment(s), thereby avoiding the risk of blocking the communication channel.