Ok, I will try.
This are the errors with can be involve with my problem:
Cron <root@xxx> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) (failed)
run-parts: /etc/cron.daily/postfix-policyd exited with return code 255/var/log/mail.warn
Dec 12 12:32:54 prosat postfix-policyd: mysql_real_connect(): Access denied for user 'postfix-policyd'@'localhost' (using password: YES)