How to Fix It
The address might be misspelled or might not exist. Try one or more of the following:
- Retype the recipient's address, then resend the message - If you're using Outlook, open this non-delivery report message and click Send Again from the menu or ribbon. In the To or Cc line, delete and then retype the entire recipient's address (ignore any address suggestions).
- Remove the recipient from the recipient Auto-Complete List, then resend the message - If you're using Outlook or Outlook on the web, follow the steps in the "Remove the recipient from the recipient Auto-Complete List" section of the relevant support article. Then resend the message.
- Contact the recipient by some other means, (by phone, for example) to confirm you're using the right address. Ask them if they've set up an email forwarding rule that could be forwarding your message to an incorrect address.
If the problem continues, ask the recipient to tell their email admin about the problem, and give them the error (and the name of the server that reported it) shown below. It's likely that only the recipient's email admin can fix this problem.