Outbound Mail broken

Posted on 2009-05-02
Last Modified: 2013-11-30
Hello, I have recently changed my public IP address for my exchange server. I am getting no outbound mail now. I keep getting the error in my queues that the remote server did not respond.  

I have even setup another NAT policy to allow my old public ip and my new public ip to my exchange server.
I can telnet to port 25 on both IP addresses
I have inbound mail coming in without issues
We use Postini and the postini tests all pass for reinjection hosts

I have tried even configuring the exchange server to bypass postini for outboudn and that doesnt work either...i called our ISP and had a reverse lookup record setup for the FQDN of the server since it wasn't resolving.... can anyone help I have tried everything i can think of and nothing is working.
Question by:mikerunkel
    LVL 20

    Expert Comment

    Do you use a smarthost?
    Do you use SPF?

    Author Comment

    Yes we use Postini as a smarthost. I am not sure what SPF is?

    Accepted Solution

    Turned out that the outbound traffic was leaving the firewall out of a different subnet so it had the wrong IP. Created a static route for SMTP traffic go out the proper interface and proper subnet and it is working.

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