Various information servers in the country and in INTERNET were studied to find out the electronic lists in Spanish existing in the field of information and library sciences. Details of each identified list and suscription addresses are given. The function of this means of communication for search, identification and transfer of information and knowledge among units and persons of different geografical areas and levels of development are also set forth. The importance of Cuban list ACIMED-L is stressed as means of exchange between the units of the National Information System of Medical Sciences and Spanish list MedRed, wich allow to share information resources in health sciences existing in INTERNET.