Okay so i have this set up
Two dedicated Exchange 2007 servers. One is in the private network 192.168.1.x/24, the other is my edge transport server in the 10.10.10.x/24 DMZ subnet in a workgroup called 'DMZ'. The edge transport server also has a seconf NIC configured with a 192.168.1.x/24 IP with no Default gateway on that NIC.
I know how you guys like to know configurations!!
All server OS are Windows Server 2003 R2
Firewall is TZ210 SonicWall
All servers are dell Poweredge 2850
Email domain currently registered to GoDaddy. with MX records pointing to my edge transport server's public IP.
I have send and receive connectors configured, I have PTR records in my ISP's public DNS. I have opened and forwarded port 25 to my edge transport server to it's 10.10.10.x/24 interface. Also, the exchange and edge transport server are both listening on port 25.
I can send email anywhere (originating from inside the exchange environment), but I cannot reply to those emails. My public FQDN to smtp.mydomain.com, and I have put that anywhere I can find "What FQDN should this server reply with to a Helo Ehlo inquiry." (that is not the exact verbiage Exchange uses, but I mostly find the spot in the send/receive connector property box.
Basically I can send to and from internal mail boxes just fine, and i can send outside of the environment. I just cannot reply to the emails sent to the outside (I have tested with 2 Gmail accounts, and one Hotmail account).
I have never set up an exchange server and I am having hella trouble. please somebody help!!