Hi Up till this AM our Exchange 2003 using to use a smart host and send all mails to our ISP for delivery. Due to changes at the ISP we cannot use them as a smart host for the volume we currently have. So in the SMTP Advanced we entered the DNS IP of the ISP and removed the smart host. The majority of domains get delivered no problem except 'magnet.mt' and 'mdrt.org' which remain in the queue. (or at least these are the problem domains so far). Since an nslookup for these domains does not show in issue can you please advise. William