It looks like something on their server! For some reason they have rejected emails from your domain. Have you tried to contact them? We had a similar problem and when I talked to their IT dept., our email was going into their spam filter. Hope this helps! Chris Chris Ruci Network Administrator P: 727 868 8373 ext 160 F: 727 868 9471 T: 866 747 2700 E: cruci@xxxxxxxxxxxxxxxxxxxxxx -----Original Message----- From: clementa@xxxxxxxxxxxxxx [mailto:clementa@xxxxxxxxxxxxxx] Sent: Thursday, December 01, 2005 7:57 AM To: [ExchangeList] Subject: [exchangelist] please help exchange 2000 http://www.MSExchange.org/ Hi I use Exchange 2000 server and when users send messages to some particular domains, i get this error message: Attention: Non-Delivery Report This report is generated by the email server at: and attached to this report was not delivered to the following recipients: Address: sa@.....com Reason: 553 5.3.0 Rejected - see http://www.spamhaus.org (553) -------------- Please help Clem ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: cruci@xxxxxxxxxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to info@xxxxxxxxxxxxxx