How can i disable that ispCP sends me mails of each and everything?

If you want to avoid getting emails from ispCP, set the DEFAULT_ADMIN_ADDRESS to an empty string in /etc/ispcp/ispcp.conf.

Or you can change the minimum level for a message to be sent to DEFAULT_ADMIN_ADDRESS. In newer ispCP versions you can do this in the GUI: log in as admin and go to Settings → General Settings. In older versions open /var/www/ispcp/gui/include/ispcp-lib.php and change $cfg['LOG_LEVEL'] to your needs.

• E_USER_NOTICE: logins, and all info that isn't very relevant
• E_USER_WARNING: switching to an other account, etc
• E_USER_ERROR: “admin MUST know” messages