If you have an Exchange 2007 server, you setup an MX record in DNS in the Forward Lookup Zone pointing to whatever prefix *.domain.com you configured in Exchange Console correct? Then you create an MX record in your Domain manager on your domain vendor's site? Or is that redundant?
I am getting SOME emails but not receiving MOST emails from external sources. I've checked certificates and they seem to be updated and pointing to the correct server.domain.com. However I've checked some of the bounce back error logs for other companies, and their email servers are connecting to my actualy domain name "domain.com" and thus it seems the wrong IP address too. So they time out and bounce back. Hotmail seems to come in just fine oddly enough. At first I thought it was a Certificate/TLS issue, but I'm beginning to think it is an MX issue. Any ideas?
Any suggestions would be appreciated.
My brain is fried, been at this since last night.
In Server 2008 in DNS the following is configured: MX  mail.mydomain.com; A mail ip.address.here (external Exchange IP); I also have a Zone separate from our root domain, that is named our mail.mydomain.com. In that Zone, there exists records for NS, SOA, MX, and A.
Now on our Domain Manager on our Domain Host vendor's site: MX - mail.mydomain.com A - our.exchange.server.external.ip
Do I have a needlessly redundant setup? I was just contacted by our Domain Host and they mentioned they were having DNS issues, which is most likely our problem. However I am still curious about our setup.