A few days ago one of our customers phoned us up to say they were not able to send out emails, i checked on the server and in the Exchange Queue's there were over 500 domains there, each with 20 or so emails (this company send about... 30 emails in total a day, each to different domains) when i clicked on the domain and checked the messages there were from either the Postmaster, or someone who didnt work for the company (bar a few domains which had legit emails in). Since then i have cleared up the queue (from the System Manager also from the Exchsvr directory) and the next day there were yet again 500 or so domains! I am compleatly lost on this issue, it is very urgent as it is the companys third day without outgoing emails. We host their internet and all of the other customers emails are fine so i have rules a problem with the DNS out. The setup of their server is; Small Business Server 2003 Standard, Emails are collected via an external POP3 box and are sent out via DNS, the internet is connected through a one port router which is connected to a seccond NIC. If you require any more information feel free to ask!