We have some new exchange 2010 sp1 servers (3 hub/cas and 3 mbx). We also have one old exchange 2003 server that is currently in use. And then finally, we have one more exchange 2003 frontend server that we want to remove. If I remove the network cable for this old frontend server, all mail between the exchange 2010 and 2003 server is not reaching its destination. And all mail sent from other sites do not reach the exchange 2010 server.
So I look at the connectors on the 2010 server, one of the connectors are an internal connector that is set up to point to the correct 2003 server. And then we have a SMTP connector that send the email directly to our spam server on the way out of the organization, and finally there is a 3rd connector that also is a SMTP connector that is pointing from the old 2003 server (that are in use), and this also point to the spam server going out of the organization. On our exchange 2010 server we cannot find any connectors that point to the old frontend server.
Then I go to the 2003 frontend server, and I see a connector that is grayed out, and looks like it has been created by a later version of exchange. This connector is a connector between the frontend server and the exchange 2010 server. I find one for both directions. This connector I find in ADSI Edit, and there I can do some changes, so I change it to Cost 2.
Now I remove the network cable for this old frontend server again, and all mail is going as normal, except when we send mail from an account on the 2010 to the 2003 that is in use. We can send mail from 2010 to mail address outside our organization, and the users on the 2003 server can send mail to the users on the 2010 server. So it looks like this connector can be deleted, except that it seems that it still makes some problems for my internal connector between the 2010 server and 2003 server.
Are there any tools I can use to find out what is happening to the mail flow? Can I uninstall this old frontend?