Hi I installed Exchange Server 2010 on my Server and configure it , I sent many emails to gmail accounts,but there is a problem to send to yahoo mail. when i wan to to send to yahoo mail I deliver this Error : Delivery has failed to these recipients or groups: MailName@yahoo.com (MailName@yahoo.com) The e-mail address you entered couldn't be found. Check the address and try resending the message. If the problem continues, please contact your helpdesk. Diagnostic information for administrators: Generating server: DC.MS.com MailName@yahoo.com #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## Original message headers: Received: from DC.MS.com ([fe80::f83f:3455:9253:b0be]) by DC.MS.com ([fe80::f83f:3455:9253:b0be%15]) with mapi; Mon, 25 Jul 2011 13:25:37 -0700 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: binary From: Administrator <Administrator@ms.com> To: "MailName@yahoo.com" <MailName@yahoo.com> Subject: Hello Yahooo Thread-Topic: Hello Yahooo Thread-Index: AcxLCQCsbw0GBUVmSlSQAj3qqXI16Q== Date: Mon, 25 Jul 2011 13:25:32 -0700 Message-ID: <4D1D27671442004A8BB307C2EF87310D0407A8@DC.MS.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: <4D1D27671442004A8BB307C2EF87310D0407A8@DC.MS.com> x-cr-hashedpuzzle: AM7g AlJD DAzy DEIY D5gM ECp8 EGRh FD8k FvRW GmOg HMh/ Huig JLRz JQ1q JXkV KLet;1;cwBfAG0AaQBsAGEAZABfAGEAaABtAGEAZABpAEAAeQBhAGgAbwBvAC4AYwBvAG0A;Sosha1_v1;7;{C1753731-8955-4C13-A7FA-24EDB8051BDB};YQBkAG0AaQBuAGkAcwB0AHIAYQB0AG8AcgBAAG0AcwAuAGMAbwBtAA==;Mon, 25 Jul 2011 20:25:32 GMT;SABlAGwAbABvACAAWQBhAGgAbwBvAG8A x-cr-puzzleid: {C1753731-8955-4C13-A7FA-24EDB8051BDB} MIME-Version: 1.0 ----------------------------------------------------- PLZ Help Me What shall I do?

As per the error message, it says Email address is not valid. You should try another email address of Yahoo and check, it should work.Gulab | MCITP: Exchange 2010-2007 | Skype: Gulab.Mallah | Blog: www.ExchangeRanger.Blogspot.com

I don´t think that your Exchange Server even tried to deliver that message. How is your SendConnector configured? Run the following Get-SendConnector | fl Identity,AddressSpaces,DNS* and post the output here. :MartinaPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question.

I added some accepted Doman (Yahoo.com && Google.com) I remove them and work correctly ----------------- another question: I have not valid Dmain KC.com i installed an exchange server to route emails in my company and to out of company can we use a technic to send an email to other valid domain like gmail and yahoo with valid email???? for example :my domain is KC.com and when my domain user: (A1@Kc.com ) want to send an email to (fred@gmail.com) , fred see this in his gmail from : KCgroup@gmail.com to :fred@gmail.com ?

NO, that would be spoofing.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question.

I have non-valid Domain in my ms Windows Server 2008 (KC.com) I installed an exchange server to route emails in my company and to out of company can we use a technic to send an email to other valid domain like gmail and yahoo with valid email???? for example :my domain is KC.com and when my domain user: (A1@Kc.com ) want to send an email to (fred@gmail.com) , fred see this in his gmail from : KCgroup@gmail.com to :fred@gmail.com ?

Hi, Any updates on this issue? Do you follow Gulab’s suggestion to test with another account? If the issue persist, you can use Exchange Remote Connectivity Analyzer (do an outbound email test) to help you troubleshoot the problem. Exchange Remote Connectivity Analyzer https://www.testexchangeconnectivity.com/ Thanks, Evan

Evan, There is a missing post in this thred from the person who had problem. He wrote: I added some accepted Doman (Yahoo.com && Google.com) I remove them and work correctly ****************************** So it wasn´t really a problem. Just bad configuration, Martina Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question.

Hi Martina, Thank you for telling me. Best Regards, Evan