Hi all,One of my clients is running EBS 2007. Since about 3 months ago they struggle to send emails to a certain domain, all other domains are fine. I have also checked that their MX and PTR are correct. Below is the error they receive, I am not going to hide domains etc, to help with troubleshooting;---------------------------------------------------------------------------------------------------From: Microsoft Exchange Sent: 01 February 2010 10:37 AMTo: Ricky HolmesSubject: Undeliverable: RE: Feedback form Delivery has failed to these recipients or distribution lists: Bridget GoreAn error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator. The following organization rejected your message: server2.gosmpl.com. _____ Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators: Generating server: xs-sec.xabiso.local bridget@medialink.co.zaserver2.gosmpl.com #550-Verification failed for <ricky.holmes@xabiso.co.za> 550-No Such User Here 550 Sender verify failed ## Original message headers: Received: from xs-msg.xabiso.local (192.168.10.3) by remote.xabiso.co.za (192.168.10.2) with Microsoft SMTP Server (TLS) id 8.1.240.5; Mon, 1 Feb 2010 10:36:38 +0200Received: from xs-msg.xabiso.local ([192.168.10.3]) by xs-msg.xabiso.local ([192.168.10.3]) with mapi; Mon, 1 Feb 2010 10:36:37 +0200From: Ricky Holmes <ricky.holmes@xabiso.co.za>To: Bridget Gore <bridget@medialink.co.za>Date: Mon, 1 Feb 2010 10:36:37 +0200Subject: RE: Feedback formThread-Topic: Feedback formThread-Index: Acqek0GDf8xLYAqGEd+XIgAbY7RD5AEhmaTgMessage-ID: <C74E2F2CD1CFD14EBB1F55366747155C9D4A067D3C@xs-msg.xabiso.local>References: <C784C7B8.258E%bridget@medialink.co.za>In-Reply-To: <C784C7B8.258E%bridget@medialink.co.za>Accept-Language: en-US, en-ZAContent-Language: en-USX-MS-Has-Attach: yesX-MS-TNEF-Correlator:acceptlanguage: en-US, en-ZAContent-Type: multipart/related; boundary="_005_C74E2F2CD1CFD14EBB1F55366747155C9D4A067D3Cxsmsgxabisolo_"; type="multipart/alternative"MIME-Version: 1.0Return-Path: ricky.holmes@xabiso.co.za---------------------------------------------------------------------------------------------------------------

Looks like the user's email address is not valid. See the NDR carefully " 550-No Such User Here 550 Sender verify failed #"Raj

Which user? ricky.holmes@xabiso.co.za wich is the one sending to bridget@medialink.co.za which does exist, confirmed with their Administrators.