To measure the performance of a system for the transmission of multimedia messages, a parametrizable module for the generation of multimedia messages is used. The subject field of the multimedia messages produced by the generation module comprises information on the multimedia message. This subject field is retrieved in the notification messages sent by a relay server. These notification messages are filtered by a filtering module. (206). The result of the filtering is given by a module (202) for the retrieval of multimedia messages. The result of the retrievals is compared with the sending operations made by an analysis module (203) to produce statistics on the working of the system.