A method and network for transmitting a message from a sender to a recipient wherein the sender has no previous knowledge of the recipient's identity. A method is provided for registering a user with a web-enabled database service by providing correlating data on the user's identity and vehicle license plate number and/or other vehicle identifying information. A sender observing a vehicle can send a message to the recipient by logging onto the service and sending a message including the license plate number of the vehicle or other vehicle identifying information. The service will forward the message to the recipient by looking up the vehicle information, discerning the most appropriate communications method(s), and causing the message to be transmitted to the recipient or stored for later delivery.