Authentication

Hi I am newcomer to freeradius, I use the version is 1.1.3 release 1.4.el5 is coming in the repository of centos, my users are in the windows directory, I would like to authenticate users as follows michel@casa.co.cu. Excuse my English is very poor, appreciate any help Thanks Michel ---------------------------------------------- Webmail, servicio de correo electronico Casa de las Americas - La Habana, Cuba.