Hi,
I am new to Exchange 2013 and have read many posts regarding this topic, but I'm still a little confused! So any help or advise would be greatly appreciated.
Basically, we have a current email system (hosted by Rackspace), and have also installed Exchange 2013 on our own server.
Both email system are using the same domain name - lets says 'mydomain.com'
I would like to migrate users (one by one) over to our exchange server. However, I would like to setup a relay so if a user doesn't exist on our own Exchange server, the message will then be relayed to Rackspace.
I have setup our Exchange server as an internal relay, which relays a message sent to a mailbox that doesn't exist back out to our MX records (which currently point to Rackspace) - This works well at the moment, but I'm assuming wont when we change our MX records to point to our exchange server.
How do I go about relaying messages to a specific MX record - say mx1.emailsrvr.com?
Hope this makes sense and thanks in advance for any help.