Exchange 2003, Swing Migration
According to: http://www.amset.info/exchange/migration.asp
Smart Host Configuration on the "Default SMTP Virtual Server".
If you have configured an entry in the Smart Host box then you need to remove it and replace it with an SMTP Connector. Exchange uses SMTP to communicate between the servers. Using a Smart Host on the "Default SMTP Virtual Server" will stop the messages going between the servers.
So, there is one SMTP Virtual Server on the old server. There is a Smart Host configured (10.10.10.10)
Under routing groups, there is a custom one (say, google.com) and Default... which of course says forward all mail to smart host as above.
If I remove the smart host per the article, what becomes of mail flow, or am I missing a step? What do I need to do for prep here?