Scenario is a small business running SBS 2008 with Exchange Server 2007. Business previously used <legacyDomain.com> but is now in transition to <newDomain.com> and wishes (temporarily) to retain <legacyDomain.com> whilst publishing generic address office@newDomain.com So, I have added an additional Accepted Domain (using Hub Transport within Organization Configuration within Exchange Management Console) - and we now have: <local> - Authoritative - not default legacyDomain - Authoritative - default newDomain - Authoritative - not default Test messages sent to office@newDomain.com are bounced with this header: A message ... could not be delivered. ... The following address(es) failed: office@legacyDomain.com (generated from office@newDomain.com) SMTP error from remote mailer after RCPT TO:<office@legacyDomain.com>: host mail.legacyDomain.com [IP address] 550 5.1.1 User unknown Please note that a Distribution Group named 'office' has been created within <local> with both office@newDomain.com and office@legacyDomain.com assigned to it. Do I need to create an Edge subscription (or similar)? Any help will be very welcome!

Do I need to create an Edge subscription (or similar)? Do you have an Edge Server? If not, no. If yes, are you sending the email from inside the organization? If so, a hypothetical Edge Server would not come into play. Mail flow would be something like this: Sender MBX (MBX server role) > HT server role > Recipient MBX (MBX Server role). In your case, these server roles are on the same machine (correct?).

Scenario is a small business running SBS 2008 with Exchange Server 2007. Business previously used <legacyDomain.com> but is now in transition to <newDomain.com> and wishes (temporarily) to retain <legacyDomain.com> whilst publishing generic address office@newDomain.com So, I have added an additional Accepted Domain (using Hub Transport within Organization Configuration within Exchange Management Console) - and we now have: <local> - Authoritative - not default legacyDomain - Authoritative - default newDomain - Authoritative - not default Test messages sent to office@newDomain.com are bounced with this header: A message ... could not be delivered. ... The following address(es) failed: office@legacyDomain.com (generated from office@newDomain.com) SMTP error from remote mailer after RCPT TO:<office@legacyDomain.com>: host mail.legacyDomain.com [IP address] 550 5.1.1 User unknown Please note that a Distribution Group named 'office' has been created within <local> with both office@newDomain.com and office@legacyDomain.com assigned to it. Do I need to create an Edge subscription (or similar)? Any help will be very welcome! do you get this error when you try to email to this distribution group (DG) outside your company i mean from gmail or hotmail account? If so then you need to allow non-authenticated users to send email on this group.

Unless SBS 2008 implements an Edge server by default then we don't have one. This is a single server (machine) scenario.

The test messages were sent from a remote machine on an entirely separate network - I've not tried sending to it from the local network. I don't think I understand your point about non-authenticated users ...

this is a very common issue or a common mistake. by default non of the newly created distribution group allow anyone from outside organization to to accept email. Follow these then u are all set Right clik and take the properties of your Distribution Group Click on MAIL FLOW SETTINGS TAB Take the properties of MEssage Delivery Settings Un-check this option - Require that all senders are authenticated

Is this box checked? http://www.offsitenoc.com/blogs/wp-content/uploads/2009/12/exch.gif (This is in the properties of the group - mail delivery restrictions) If so, then outside (normally non-authenticated users) will not be able to send to the group. Please uncheck the box and have someone try again. Edge Server - no, you do not have one.