mailcow-dockerized/data/conf/postfix/config_templates/mysql_virtual_alias_maps.cf.j2

user = {{ DBUSER }}
password = {{ DBPASS }}
hosts = unix:/var/run/mysqld/mysqld.sock
dbname = {{ DBNAME }}
query = SELECT goto FROM alias
  WHERE address='%s'
    AND (active='1' OR active='2');