It is presented a method for transmitting a message for a recipient, the method being performed in a message transmitter of a sender, the sender being a user of the message transmitter. The method comprises the steps of: receiving user input for a new message, the new message comprising an identifier of a recipient physical space and payload data; reading a local identifier forming part of a physical device arranged at a sender physical space, the sender physical space being associated with the sender; and sending a request to a message server to transmit the new message to the recipient physical space, wherein the request comprises the new message.