Ok, sorry for waiting. I have reinstalled the whole Server with Debian7 now.
After i create a new Mail-Domain, i got a Welcome-Mail on my account. But if i try to send a Mail, i got "Connection refused". I also got no Mails, which are send to this email-adress.
In /var/log/mail.err I see :
amavis: (01241-11) (!!)TROUBLE in process_request: connect_to_sql: unable to connect to any dataset at (eval 111) line 247, <GEN35> line 420. at (eval 112) line 322, <GEN35> line 420.
and in mail.warn I got an error, for missing mysql:
postfix/proxymap: warning: connect to mysql server 127.0.0.1: Can't connect to MySQL server on '127.0.0.1' (111)
So i had a look into /etc/postfix/mysql-virtual_mailboxes.cf
I use those connection-Data and log me in. But i didn't see any other DB as "information_schema, dbispconfig, test".
Must there be a db for my mails?!
netstat -tap | grep mysql
tcp 0 0 *:mysql *:* LISTEN 24118/mysqld
tcp 0 0 localhost.localdo:36780 localhost.localdo:mysql ESTABLISHED 2161/amavisd-new (c
tcp 0 0 localhost.localdo:mysql localhost.localdo:36790 ESTABLISHED 24118/mysqld
tcp 0 0 localhost.localdo:36790 localhost.localdo:mysql ESTABLISHED 22121/amavisd-new (
tcp 0 0 localhost.localdo:mysql localhost.localdo:36780 ESTABLISHED 24118/mysqld