My Server 2003SBS cannot send mail now but can receive mail if user send mail to outside ,server will return mail to user said ip name lookup failed i think is server DNS problem , i try to change ISP DNS,but still failed have any idea to fix it? Think!

Archers, Can you visit websites from this server ? Maybe dns is blocked in a firewall or something ?

Hello Archer, What have you done to your SBS 2003 server? Have you changed your Network configuration? If so, Id suggest you run the " Configure E-mail and Internet Connection Wizard " according to your network topology so that it will configure your email and Internet connection automatically. Its fantastic! Here are two articles for your reference: Configure E-mail and Internet Connection Wizard Options http://support.microsoft.com/kb/825763/en-us Troubleshooting Windows Small Business Server 2003 http://download.microsoft.com/download/5/6/1/561c9fd7-0e27-4525-94ec-4d2d38f61aa3/TSHT_SBS.htm Hope this helps.