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Reverse DNS has internal domain

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  • Reverse DNS has internal domain

    We have upgraded our exchagne 2003 to exchagne 2010.

    Emails are working fine, except for some domians.

    When i check the queue, it has error of "550 Service unavailable; client host [ip_address] blocked using trend micro RBL+"

    So i did smtp lookup from mxtoolbox, which gave the following result:

    220 DADEXCH.dadholding.local Microsoft ESMTP MAIL Service ready at Tue, 22 Feb 2011 15:44:04 +0300

    OK - resolves to
    Warning - Reverse DNS does not match SMTP Banner
    0 seconds - Good on Connection time
    Not an open relay.
    6.482 seconds - Warning on Transaction time

    Session Transcript:
    250 DADEXCH.dadholding.local Hello [] [246 ms]
    MAIL FROM: <[email protected]>
    250 2.1.0 Sender OK [246 ms]
    RCPT TO: <[email protected]>
    550 5.7.1 Unable to relay [5245 ms]
    221 2.0.0 Service closing transmission channel [246 ms]

    I dont know how my internal domain "dadholding.local" is available here ("DADEXCH is our Exchange server name").

    I checked the Receive connectors, which has the FQDN as DADEXCH.dadholding.local, do i need to change it to
    And for my Send Connector, the FQDN was blank, so i added

    So please guide to have a good DNS MX records for my mail server.


  • #2
    Re: Reverse DNS has internal domain

    The most important thing is to set the FQDN on the Send connector to match your public FQDN for the server, which is

    The FQDN set on the Receive connector isn't important but I set it to match the FQDN on the Send connector for consistencies sake.