Check the dns records in both the dns server. May be its the problem with mx records u have in dns. Even if it is there then check the smtp properties whether its configured with the public ip or not???? Thanks and Regards, V.Venu Transdyne IT Services Pvt Ltd., 23355666 x 333 vvenu@xxxxxxxxxxxxxxx ------------------------------------------------------------------------------------------------------------------------ Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. Opinions, conclusions and other information in this message that do not relate to the official business of my company shall be understood as neither given nor endorsed by it. -----Original Message----- From: Anand Shetty [mailto:anands@xxxxxxxxxxxxxx] Sent: Wednesday, December 31, 2003 10:49 AM To: [ExchangeList] Subject: RE: [exchangelist] Change of Default SMTP Address not replicated with ADC Dear list i have installed 2 MS Exchange 2000 (EX1 and EX2) EX1 ip address 150.50.126.99 domain name: sysinfo.com server name: server_cc EX2 Ip address 150.50.126.105 domain name: infosys.com server name: mail_cc able send and recieve mail ,internal mail working fine but external mail is not working that is im not able to send mail from EX1 to EX2 can any one help me??? regards Anand