Abstract: A microprocessor (12) is connected to the elecronic mail system in order to receive the data items which identify the queueing messages and a random access memory (16) is organized to form a file (FIL) containing codes (u.sub.1, u.sub.2 . . . u.sub.n) which identify predetermined addressees of messages and data items (n.sub.1, n.sub.2 . . . n.sub.n) representing the telephone numbers of these addressees. A modem circuit (17) connected to a telephone line (6) is organized to extract the telephone number data items from the said file (FIL) and dial the telephone numbers of the addressees automatically in order to transmit call signals to them on the telephone line. The microprocessor (12) is organized to read the queueing file of the messages received in the electronic mail system in order to detect there the presence of the identification codes (u.sub.1, u.sub.2 . . . u.sub.