Enter the domain name (or IP address) of the sender in the field provided and click Enter. (The domain name is the portion of the sender's email address after the @ eg. for jbloggs@thisisthedomain.com you would enter thisisthedomain.com)

• If the computer or domain is invalid the result will be in the form of
  Host thisisthedomain.com not found: 3(NXDOMAIN)

Note: Senders will need to contact their administrators or ISPs to have the problem resolved.

• If the computer or domain is valid the result will be in the form of
  msn.com has address 207.68.172.246