「Delivery Status Notification (failure)」という件名のメール本文に「User unknown」や「Unknown user」と記載されている場合は宛先の＠マークより前の部分が、「Host unknown」または「Host not found」と記載されている場合は＠マークより後ろの部分が間違っている可能性があります。. To get support in Outlook.com, click here or select Help on the menu bar and enter your query. If the self-help doesn't solve your problem, scroll down to Still need help? and select Yes.. To contact us in Outlook.com, you'll need to sign in.
they receive a delivery status notification (failure) afterwards. These bounce-back notifications typically occur when you send or forward an email to a non-existent address . If you haven't manually done this, please check your email forwarding settings and rules .. Open the email if necessary to see if it is a legitimate delivery notice. But don't open any attachments in those emails. Make sure the recipient's email address is correct before taking other measures. Restart the device. A reboot often fixes Delivery Status Notification (Failure) in a Live Mail account or Outlook client.