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I use Outlook with an EarthLink address, with Windows 8. I've been using this just fine until this week. What's going on?
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
It means you or somebody with access to your account is sending email to an address that no longer exists. – Ramhound – 2014-11-14T13:54:36.843
In addition to the condition Ramhound describes, there could be other problems related to the destinating server. The key point is that it doesn't indicate a problem at your end (unless every email you send produces that message regardless of who it is sent to). – fixer1234 – 2014-11-14T15:17:48.507