Reverse DNS issue

Posted on 2009-02-10
Last Modified: 2013-12-14
I am getting a non deliverables from this outside servers.

The recipient could not be processed because it would violate the security policy in force
< #5.7.7 smtp;554 5.7.7 PTR invalid

I think my problem is this:

We use Exchange 2003 to send out email which is set up to go out via our Comcast line.  However, our incoming email comes in from our Verizon line.  There is a ptr record for our Verizon public IP but not one for Comcast which is used by the Exchange to send out.  Do I need to set up another pointer record for the Comcast public IP that we send out from?
Question by:cwojcicki1099
    LVL 19

    Accepted Solution

    Yes you do.
    LVL 31

    Expert Comment

    by:Rodney Barnhardt
    You can test your mail on and find any corrections you need to make to your network.
    LVL 17

    Expert Comment

    Let me help you...

    what ever connecting IPs you have you should have a PTR Record set up for it...
    For PTR Record you need to contact Your ISP and there you need to ask them to create the PTR record for your connecting IP.

    let me know if you want help find your connecting ip....

    LVL 17

    Expert Comment

    do the following on the command prompt :

    telnet 25

    after ehlo you will find one IP address showing up.. That is your connecting ip
    you can also go to and find it...


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