I have an issue that I need some help with. I am installing a new Exchange 2010 CAS/MB/HUB server and using a TMG server as my Edge w/ Forefront Protection for Exchange.
I have two internal IP address set up on the external interface on the TMG which is on my DMZ (10.2.2.2 and 10.2.2.3). On my router the 10.2.2.2 NATs to a say an external address of 22.214.171.124 and the 10.2.2.3 address NATs to external 126.96.36.199.
I have setup my email to use the external address of 188.8.131.52 and my ISP has correctly changed the DNS record to mail.domain.com I have setup all published rules and I am able to receive mail with no problems. My issue comes into play when I send email. I am noticing that the messages are being sent out from the TMG server using the 184.108.40.206 address which is an incorrect reverse DNS for mail.domain.com
I have read that I need to create an ENAT rule on the TMG using basically this guide here:
I have done that and I can get the outbound traffic of the Exchange server to NAT to the correct IP of 220.127.116.11 but when mail is sent to from the Exchange to the TMG and then TMG sends it out to whatever mail server the originating IP is 18.104.22.168
Anyone have any ideas to help me out?