Oh thank you very much ... really i can understand all the first time :
$~apt-get install postgrey
$~sed -i 's/--inet=127.0.0.1:60000/--inet=127.0.0.1:60000 --delay=29/' /etc/default/postgrey
$~postconf -e "smtpd_restriction_classes = check_greylist"
$~postconf -e "check_greylist = check_policy_service inet:127.0.0.1:60000"
But the second part i can't understand because i thought it was only necessary modified the whitelist_client and whitelist_recipients, then... how i do make to create this "access" file or where it ??? and where should i put the greylist_sender_exceptions file???
Thank you again and i hope your answer..