How to set up PTR record on SBS 2003 DNS

Discussion in 'Windows Small Business Server' started by Warren Smith, Aug 5, 2004.

  1. Warren Smith

    Warren Smith Guest

    Hi, all

    We cant send emails to several domain names as we didnt have a Reverse DNS
    entry for the MX record. Our MX record is hosted our ISP. I contacted their
    technical support officer and was informed they didnt set up a Reverse DNS
    entry for any domain name. They also suggested i should be able to set up a
    PTR record on our SBS 2003 Server... Would your guys give me a detailed
    information how can i get it set up correctly? Tks in advance!


    Warren Smith, Aug 5, 2004
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  2. Hi Warren,

    The question is who owns the dns of your public address ? don't look at the
    domain name itself but at the ip. Go to the following site, put your ip range in the whois search and it will
    tell you who is responsible for that range. If it is belonging to your isp,
    then your isp has to set up the reverse dns for you.

    Miguel Jamous, Aug 5, 2004
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  3. Javier Gomez [SBS MVP], Aug 5, 2004
  4. I don't know how you phrased your question to the ISP, but they gave you bad
    advice. You likely already *do* have a reverse lookup in your internal DNS
    for your Exchange box - but it isn't relevant. Have your ISP set up the
    PTR....they're the only ones who can do it.
    Lanwench [MVP - Exchange], Aug 5, 2004
  5. Warren Smith

    Chester Guest

    Hello there, we are in the same boat, and trying to understand what we need
    to ask them to set it up to point to!

    Our network is structed like this: DSL Modem>Router (static IP set here)>Wan
    NIC on SBServer.

    So do we need them to change to PTR record to point to our static IP?
    Or something else? Our public domain is hosted somewhere OTHER than our ISP.

    Thanks for any input!

    "Lanwench [MVP - Exchange]"
    Chester, Aug 5, 2004
  6. Are you running ISA or the SBS2003 firewall?
    Whomever owns your public IP netblock has to do it's your ISP.
    You can't do it yourself. Generally, it doesn't matter *what* the PTR is -
    as in, it doesn't have to match your mail server's FQDN - the very presence
    of the record is more of the issue.
    Lanwench [MVP - Exchange], Aug 5, 2004
  7. Longer term, it is going to matter. Some mail servers already verify
    that the forward (ie MX) and reverse (PTR) DNS records match, some
    don't (eg AOL).

    If the ISP won't let you have the name of your choice on the PTR
    records - which is quite likely on many DSL accounts - then your best
    bet is to make your forward name (ie MX) match the entry in the PTR
    record against your IP, and use the same FQDN in the Exchange SMTP
    Steve Foster [SBS MVP], Aug 5, 2004
  8. Warren Smith

    Warren Smith Guest

    Tks, guys. This website did help me a lot. However,
    i still got a little bit confused... Let me tell you the brief story of our
    IT services.
    Currently, Optusnet is hosting our domain name and 2 MX records
    ( and, another ISP company provides
    us a Static IP address and its DNS servers. The problem MX record is our
    static IP address which has been set up by optusnet to point to our
    exchanger server. I did contact my ISP company one month ago and was
    informed they had to recreate another MX record for us to set up a PTR
    record, which would make a thing more complicated....Please advise!!!
    Cheers, Warren
    Warren Smith, Aug 6, 2004
  9. That's piffle.

    Your MX records are completely unrelated to your reverse DNS records
    (technically, they're not your reverse DNS records, they belong to the
    ISP that owns your IP address block).

    The only information your ISP need is the name that they should use for
    the PTR record, and for this you would use as per
    your MX.
    Steve Foster [SBS MVP], Aug 6, 2004
  10. Not yet maybe. That's why I said "longer term". But if you're going to
    do the reverse DNS check, you may as well verify that the results
    match. Otherwise, it's arguable whether there's any point doing the
    check at all.
    Steve Foster [SBS MVP], Aug 6, 2004
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