We're running Windows 2003 Small Business Server with Exchange. It is fully patched with all availble Microsoft updates. Within the last week our incomming E-Mail has completely stopped for no reason. Outbound E-Mail will reach their destination fine, but inbound from mail servers such as GMail, Yahoo or Comcast will not reach the server. When I sent a test E-Mail to myself it says something about a DNS issue. I'm not sure how this could be a DNS issue when no settings have been changed?
Thanks for the insight.