We have two exchange 2007 servers in the same domain one in London, one in Singapore connected via VPN.
We use a smarthost to send mail out.
External mail goes out via London server ok no problems.
Internal mail for some reason routes via Singapore server for every email causing Internal emails to have a huge lag time.
We have tried creating two different send connectors, one for each server with the cost for the London server lower than the Singapore server but it still routes through Singapore first.
We have tested with blocking the link between the two usng firewall and when we do, the mail then routes through London server.