auth: Warning: sql: Ignoring changed user_query in /etc/dovecot/dovecot-sql.conf, because userdb sql not used
такая ошибка

такие настройки
password_query = SELECT username as user, password FROM mailbox WHERE username = '%u'
user_query = SELECT '/var/vmail/%d/%n' AS home, 5000 AS uid, 5000 AS gid, CONCAT('*:bytes=', CAST(quota AS CHAR)) AS quota_rule FROM mailbox WHERE username = '%u' AND active = '1'