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Issue relaying from DMZ server

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  • Issue relaying from DMZ server

    I have a server in the DMZ that is not connected to the domain and is on a different subnet to the internal LAN.

    I have an Exchange 2010 server on the internal LAN and a receive connector has been configured as eternally secured

    Firewall lets SMTP traffic through from the DMZ to LAN

    When I telnet from the DMZ server and set RCPT TO: internal address it works fine but when I specify RCPT TO: external address
    It gives me a 550 5.7.1 Unable to relay error.

    I cannot see why this is not working, any idea what I am missing ?

  • #2
    Re: Issue relaying from DMZ server

    Upon further investigation I noticed that when I turned on logging for that receive connector that nothing was being logged. I turned on logging for all receive connectors and noticed that the HELO reply was coming from the public IP of the DMZ server instead of the internal address. I wrote a NAT policy on the firewall for SMTP traffic from the DMZ server and this resolved the issue.

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