Relay emails to different external hosts
I recently came up with a demand to relay emails to external hosts. To become clearer, here's what i need.
We have 3 sites A(Primary site),B,C. Lets assume that there is no site-to-site vpn connection.
We have one domain, @mydomain.com.
What we want to do is, when an email arrives to the messaging gateway at site A, to check where the recipient is located (site B,C) and forward it there, instead of delivering it to site A.
For the time being all 3 sites have a vpn connection. All 3 have Exchange 2010 which is configured to distribite the email to each site (but that happens after it is delivered to site A, the exchange on site A takes care of the distribution). We are having problems with the vpn site-to-site connection so we are trying to find an other way around it. All users are under the @mydomain.com (no @asite.mydomain.com etc exists, and it is something we would like to avoid)