PostgreSQL core
Dear developers,
As you know, the PostgreSQL starts there, where MySQL dies..... My ISPConfig 3 server died by 550 MySQL threads. Someone tried to send spam :-(
Another request: you shold use different MySQL user name for postfix, courier and FTP. By using these, I could restrict the MySQL connections. 100 for postfix and SASL. It seems that's just enough. The right solution is switch to PostgreSQL.
By the way: I really like this project, thank you!