# Database driver: mysql, pgsql, sqlite
driver = mysql

[...]

# Database connection string. This is driver-specific setting.
connect = host=127.0.0.1 dbname=mailserver user=mailuser password=example_password

[...]

# Default password scheme.
default_pass_scheme = SHA512-CRYPT

[...]

# passdb query to retrieve the password.
password_query = SELECT email as user, password FROM virtual_users WHERE email='%u';