user = {{ mail_db_username }}
password = {{ mail_db_password }}
hosts = 127.0.0.1
dbname = {{ mail_db_database }}
query = SELECT concat(username, '@', domain) AS 'owns' FROM virtual_users WHERE username = '%u' AND domain = '%d' UNION SELECT destination AS 'owns' FROM virtual_aliases WHERE source = concat('%u', '@', '%d');