Buenas listeros: Les comento, tengo un servidor de correos en postfix con autenticacion en dovecot, pero en ciertos dias el servidor sufre de ataques de diccionario ( o al menos eso creo), le instale el fail2ban para que bannee a las IP que tratan de conectarse pero aun asi sigo teniendo problemas. Ahi va la salida de logwatch : pastebin (http://pastebin.com/L3sb7trF# dovecot: Authentication Failures: sales rhost=222.218.142.194 : 20 Time(s) paul rhost=222.218.142.194 : 18 Time(s) admin rhost=222.218.142.194 : 16 Time(s) daniel rhost=222.218.142.194 : 16 Time(s) peter rhost=222.218.142.194 : 14 Time(s) john rhost=222.218.142.194 : 12 Time(s) office rhost=222.218.142.194 : 12 Time(s) temp rhost=222.218.142.194 : 12 Time(s) test rhost=222.218.142.194 : 12 Time(s) anna rhost=222.218.142.194 : 10 Time(s) cyrus rhost=222.218.142.194 : 10 Time(s) help rhost=222.218.142.194 : 10 Time(s) news rhost=222.218.142.194 : 10 Time(s) thomas rhost=222.218.142.194 : 10 Time(s) veronica rhost=222.218.142.194 : 10 Time(s) vladimir rhost=222.218.142.194 : 10 Time(s) webadmin rhost=222.218.142.194 : 10 Time(s) webmaster rhost=222.218.142.194 : 10 Time(s) amanda rhost=222.218.142.194 : 8 Time(s) backup rhost=222.218.142.194 : 8 Time(s) caroline rhost=222.218.142.194 : 8 Time(s) contact rhost=222.218.142.194 : 8 Time(s) demo rhost=222.218.142.194 : 8 Time(s) donald rhost=222.218.142.194 : 8 Time(s) edward rhost=222.218.142.194 : 8 Time(s) evita rhost=222.218.142.194 : 8 Time(s) jeff rhost=222.218.142.194 : 8 Time(s) marketing rhost=222.218.142.194 : 8 Time(s) martin rhost=222.218.142.194 : 8 Time(s) merlin rhost=222.218.142.194 : 8 Time(s) michael rhost=222.218.142.194 : 8 Time(s) michel rhost=222.218.142.194 : 8 Time(s) mike rhost=222.218.142.194 : 8 Time(s) oracle rhost=222.218.142.194 : 8 Time(s) postfix: 8 Time(s) postmaster rhost=222.218.142.194 : 8 Time(s) staff rhost=222.218.142.194 : 8 Time(s) student rhost=222.218.142.194 : 8 Time(s) thierry rhost=222.218.142.194 : 8 Time(s) albert rhost=222.218.142.194 : 6 Time(s) bdsistemas: 6 Time(s) info rhost=222.218.142.194 : 6 Time(s) james rhost=222.218.142.194 : 6 Time(s) tom rhost=222.218.142.194 : 6 Time(s) abc rhost=222.218.142.194 : 4 Time(s) admins rhost=222.218.142.194 : 4 Time(s) alex rhost=222.218.142.194 : 4 Time(s) dan rhost=222.218.142.194 : 4 Time(s) elena rhost=222.218.142.194 : 4 Time(s) Gracias por la ayuda estimados. Luis Roman