USE amavis;
DELETE FROM msgs WHERE time_iso < now() - INTERVAL 1 hour AND content IS NULL;
DELETE FROM maddr WHERE NOT EXISTS (SELECT 1 FROM msgs WHERE sid=id) AND NOT EXISTS (SELECT 1 FROM msgrcpt WHERE rid=id);
DELETE FROM quarantine WHERE NOT EXISTS (SELECT 1 FROM msgs WHERE mail_id=quarantine.mail_id);
DELETE FROM msgrcpt WHERE NOT EXISTS (SELECT 1 FROM msgs WHERE mail_id=msgrcpt.mail_id);
DELETE FROM msgs WHERE mail_id IN (SELECT DISTINCT mail_id FROM msgrcpt WHERE rs='D');