I am getting the message mentioned above in the application event log on my exchange server this morning 4-30-08. I am able to receive messages from external sources, send messages to internal clients, but when I try to send external email messages, I get the following: Your message did not reach some or all of the intended recipients. Subject: RE: test Sent: 04/30/2008 8:12 AM The following recipient(s) cannot be reached: tcsimpson@sbcglobal.net on 04/30/2008 8:19 AM The message cannot be delivered due to a configuration error on the server. Please contact your Administrator. <exchange.cityhall.cityofalvin.com #5.3.0 smtp;553 5.3.0 nlpi008,DNSBL:CRBL< 64.218.238.194 >_is_blocked.For more information see:http://cbl.abuseat.org/lookup.cgi> Can someone help me to resolve this problem.

Hi, The event and the NDR is not related. It appears that you exchange server was black-listed this morning - probably because spam was sent from the address. Leif