I have found a difference between Exchange 2003 & 2007, due to circumstances I use popcon to collectemails for some of my email adress for my domain. Under ex2003 if an email address to a user for my domain could not be found in the ex2003 server it would be routed to the internet, under 2007 I get the following error reply. How can i force the ex2007 to send these emails to the internet. They will be delived to aisp wo hosts my email. some i collect and place into ex2007 some get collect direct form the isp by my relatives. thanks for the help Delivery has failed to these recipients or distribution lists: peter@domain1.netThis recipient e-mail address was not found in the recipient e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the recipient e-mail address and try resending this message, or provide the following diagnostic text to your system administrator. _____ Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators: Generating server: SVRMainXX.domain.net.au peter@domain1.net#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## Original message headers: Received: from SVRMain1a.domain.net.au ([192.168.123.200]) bySVRMain1a.cohen.net.au ([192.168.123.200]) with mapi; Wed, 22 Aug 200712:27:52 +1000Content-Type: application/ms-tnef; name="winmail.dat"Content-Transfer-Encoding: binaryFrom: Andrew Cohen <andrew@domain1.net>To: "peter@domain1.net" <peter@domain1.net>Date: Wed, 22 Aug 2007 12:30:32 +1000Subject: test emailThread-Topic: test emailThread-Index: AcfkZGmXi/mcAY30QfuTLmoD2xTirA==Message-ID: <4F8A390E58A56248B93C79B8EE0CFAEB2E424F5E@SVRMainxx.domain.net.au>Accept-Language: en-US, en-AUContent-Language: en-USX-MS-Has-Attach:X-MS-TNEF-Correlator: <4F8A390E58A56248B93C79B8EE0CFAEB2E424F5E@SVRMainxx.domain.net.au>MIME-Version: 1.0