Debian-Postfix error after update

Hello, i need some help with my mailserver and maybe someone can help me here;
After a update i can't send / receive mails, when i try to send i get an "An error occurred while sending mail. The mail server responded: Denied by policy. Please check the message and try again." (thunderbird), if i send a message from other account nothing happen mail doesn't appear.
(sorry about my english)

 

#Bump
Any help?, i can't fix it, all log seems to be right.

 

check your mail.log and make sure, that postfix, dovecot and mysql are up and running