I just installed a new exchange box into my existing 2010 environment. I had two exchange servers residing in different offices connected via VPN. Everything worked fine before I added the new box into the main office, now there are two exchange servers in one office and one remote box. When the new server came online mail stopped. Then I figured out that the new server wanted to route all mail through it. So I changed the firewall policy to route mail to the new box and it started working. Then I created the smart host, and everything is back to normal. So basically the original server, would not accept mail.
The question is, I want to add another exchange box, how do I keep the existing mail routing as is..
I'm adding another box so I can move it offsite and setup DAG's and have DR.
Thanks for your help,