I've sucessfully installed my first Exchange 2003 server into my domain along with an existing Exchange 200 Server. Over the course of a few weeks, I plan on gradually moving the databases over to the new server and removing the Exchange 2000 server. My question is concerning outgoing SMTP.
If the given mailbox has been moved to the new server, obviously it will use the new server for outgoing SMTP, this works perfectly fine, but I'm wondering if this is going to cause problems with a lot of spam filters and such.
The MX record for the domain is set to the Exchange 2000 Server for now
Exchange 2000 server obviously also has an A record
New server does not have any external DNS records as of now
Both Servers have SMTP configured to announce themselves externally as mail.domain.com
If the mail is sent from the new server, obviously it has a different IP address than the Exchange 2000 server. If the remote mailserver does a reverse lookup on the ip, it won't resolve, but also won't match the ip address that it is announcing itself as. I can see this as causing a problem, any insight?