I have created receive connector from SMTP relay and added IP address accordingly. However, it is required to create accepted domain for internal or external relay. What is the setting if I have a lot of SMTP addresses for internal and external relay? eg. 123.com, abc.com, xyz.com and etc.Kelvin Teang

Hi Steve, It is not working for my case until I added New accepted domain prd_abc.com and selected "Internal Relay Domain. Email is delivered to recipients in this Exchange organization or relayed to an email server outside this Exchange organization. Use this setting if the domain is shared by this Exchange organization and another messaging systems". Hence, my primary SMTP address is abc.com. No issue if I relay anything with abc.com That's why I am asking is it a Must to added Accepted Domain if I have multiple SMTP addresses... Kelvin Teang

Hi, Accepted domains also include domains for which the Exchange organization receives mail and then relays it to an e-mail server that's outside the Active Directory forest for delivery to the recipient. By the way, do you want to allow other organization to relay message with your Exchange Server? Or do you want to configure smarthost for your Exchange organization? Understanding Accepted Domains http://technet.microsoft.com/en-us/library/bb124423.aspx Understanding Receive Connectors http://technet.microsoft.com/en-us/library/aa996395.aspx Xiu Zhang TechNet Community Support

Hi Xiu Zhang, It is from application server to relay to different from primary smpt address.Kelvin Teang

>> That's why I am asking is it a Must to added Accepted Domain if I have multiple SMTP addresses. No, you don't need to do this. Read this article for detailed instructions on configuring relaying: http://exchangepedia.com/2007/01/exchange-server-2007-how-to-allow-relaying.html

Hi Steve, It will not work when if you want to relay to cmd_prd.abc.com for instance. Let's say your primary SMTP address is abc.com. I have tested with telnet for testing purposes. Error message is something like unable to relay due the security. It was fine after I added cmd_prd.abc.com accepted domain for internal relay.Kelvin Teang

Hi, Then I understand that you want to Exchange to relay email for additional domain. Configure Exchange 2010 to Route Messages for a Shared Address Space http://technet.microsoft.com/en-us/library/bb676395.aspxXiu Zhang TechNet Community Support