These are simple plugins written by a non-Haraka, non-SMTP and non-Mail guru, so...
Create a config/auth_mysql.ini file containing at least:
- user: username to connect to MySQL as
- password: password to authenticate with MySQL with
Optionally:
- host: MySQL hostname (default=localhost)
- port: MySQL port (default=3306)
- charset: Character encoding (default=UTF8_GENERAL_CI)
- ssl: Securely connect (default=false)
- password_query: Query to get the password (default=SELECT password FROM users WHERE user=?)