A messaging client and associated method for client-based multicast message transmission is provided. In one embodiment, the messaging client includes a message origination process with an input device, message buffer, recipient list, new message area, and multicast message transmission process. In one embodiment, the method includes: a) receiving a message content to be transmitted in a message, b) receiving delivery information for first and second recipients to whom the message is to be transmitted, c) receiving an instruction to begin the message transmission, d) transmitting the message from the client to the first recipient, and e) transmitting the message from the client to the second recipient. The messaging client and associated method relate to short message service (SMS), enhanced message service (EMS), multimedia message service (MMS), and other types of similar message services.