以下のエラーが出たら"Oct 7 10:19:01 ubuntuServer postfix/smtp[7860]: 3D8872009BB: to=, relay=none, delay=0.05, delays=0.04/0/0.01/0, dsn=5.4.6, status=bounced (mail for xxxxx.com loops back to myself)"Add xxxxx.com to the mydestination lin…