Hi All, We're on SBS2000 with Exch2000 installed.Since Two Weeks I'm Getting NDR's with error code 5.4.0 saying that Your message did not reach some or all of the intended recipients--fb92fd3bd37ca648b872a8adf6387741@xxxxxxxx on 7/9/2004 1:31 PM The destination server for this recipient could not be found in Domain Name Service (DNS). Please verify the email address and retry. If that fails, contact your administrator. Can Anybody help me to solve out this problem. Tanhks and Regards, Ahamed ________________________________________________________________________ Yahoo! India Careers: Over 50,000 jobs online Go to: http://yahoo.naukri.com/