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

user = {{ DBUSER }}
password = {{ DBPASS }}
hosts = unix:/var/run/mysqld/mysqld.sock
dbname = {{ DBNAME }}
# First select queries domain and alias_domain to determine if domains are active.
query = SELECT goto FROM alias
  WHERE id IN (
      SELECT COALESCE (
        (
          SELECT id FROM alias
            WHERE address='%s'
            AND (active='1' OR active='2')
        ), (
          SELECT id FROM alias
            WHERE address='@%d'
            AND (active='1' OR active='2')
        )
      )
    )
    AND active='1'
    AND (domain IN
      (SELECT domain FROM domain
        WHERE domain='%d'
          AND active='1')
      OR domain in (
        SELECT alias_domain FROM alias_domain
          WHERE alias_domain='%d'
            AND active='1'
      )
    )
  UNION
  SELECT logged_in_as FROM sender_acl
    WHERE send_as='@%d'
      OR send_as='%s'
      OR send_as='*'
      OR send_as IN (
        SELECT CONCAT('@',target_domain) FROM alias_domain
          WHERE alias_domain = '%d')
      OR send_as IN (
        SELECT CONCAT('%u','@',target_domain) FROM alias_domain
          WHERE alias_domain = '%d')
      AND logged_in_as NOT IN (
        SELECT goto FROM alias
          WHERE address='%s')
  UNION
  SELECT username FROM mailbox, alias_domain
    WHERE alias_domain.alias_domain = '%d'
      AND mailbox.username = CONCAT('%u','@',alias_domain.target_domain)
      AND (mailbox.active = '1' OR mailbox.active ='2')
      AND alias_domain.active='1';