Hello,I have to Allow an Outside Domain, not hosted in my exchange server, for sending email throw my serverthat will require no authentication at allcan anyone help me doing it, without open my server to an open relay?Thanks

Refer below article, you may need to configure either Internal or External relay domain for your outside domain... Managing Accepted Domains http://technet.microsoft.com/en-us/library/bb124423.aspxAmit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Thanks for your response,under Organization configuration > Hub Transport > Accepted domainI have configured a new Accpted domain as Internal relay domainbut i cant sent an email with the sander domain name from theexternal domaini got an error:the server reject the sender email address, 550 5.7.1 client does not have permissions to send as this senderim not hosted the external domain mailboxes in my Exchange server, i just haveto allow an external domain name sender to sent emailsplease advice?Thanks

Hi,You should also configure a send connector.http://technet.microsoft.com/en-us/library/aa998662.aspxRegards,Tariq

Thanks anyone for the responseJust to be clear, my Server is Up and Running, Receiving and sending emails as excepted formy domain, sosend connector configured my problem is, i have to allow and external domain name, using our SMTP exchange server how to allow an External domain for sending email from my server without getting the error above in the client sideafter the server isconfigured with a new Accpted domain as Internal relay domain the server reject the sender email address, 550 5.7.1 client does not have permissions to send as this sender any idea? Thanks

Got it working nowThank you for your response and posted links.

Hi Varmont, Would you please share your solution here? Based on my understanding, you would like to have specific external domain to relay email through your Exchange Server. I think that you need to create a Receive Connector to receive message only from the specific external domain mail server. Then, enable Anonymous user account on the receive connector and run following command to allow the anonymous user to relay email: Get-ReceiveConnector "Receive Connector Name" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient" Mike Shen TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com