I am going to say you have a DNS issue. Under Exchange System Manager, go to servers, protocols, then SMTP, then go to properties on default SMTP, delivery, advanced, then configure. I would add DNS servers in there. Ray -----Original Message----- From: Kenny [mailto:mitsubishi_kc@xxxxxxxxxxxx] Sent: Sunday, March 16, 2003 8:10 PM To: [ExchangeList] Subject: [exchangelist] Please Help, I can not send email http://www.MSExchange.org/ Hello, I have sent up an exchange server for a trading company about 2 years, It is normal. But my client told me he can't send to an email address, like xx@xxxxxxxxxxx recently. The undelivery message is " Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server. ? " I can telnet to his smtp port 25, and send test email for him rather use linux send email. Anyone have solutions please help me. Ths, : ) Kenny ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: rsumperl@xxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')