Thank u Falko
I saw my /var/log/mail.info and i saw this error:
Oct 15 06:30:42 localhost postfix/cleanup: warning: connect to mysql server 127.0.0.1: #HY000Host 'localhost.localdomain' is not allowed to connect to this MySQL server
Then I allow the localhost.localdomain to connect to mysql and problem resolved.
Thanks for u interest.