Reverse DNS and SMTP/POP3 mail

Discussion in 'Windows Small Business Server' started by Paul Proefrock, Aug 23, 2004.

  1. I am into an endless loop and hoping someone will share some wisdom with me.

    We have installed SBS2003/SP1, used POP3 connector to handle email to our
    exchange accounts, and enable DNS as the method. We can send and receive
    most mail without a problem. But some of our customers use reverse DNS
    lookup and that creates problems.

    Our static IP is assigned by our ISP, SBCGlobal, who only delegates IP
    blocks to whomever handles your DNS Server, they will not manage or enable
    reverse lookups. Our email and Website is hosted by, who
    will not accept delegation of addresses for DNS.

    One way of correcting this would be switch to mail forwarding rather than
    DNS, but I understand that this has some probable email problems in that
    other mailservers filter based on relays/forwarding. We might be fixing one
    problem and creating two others.

    Has anyone else experienced this and reached a workable solution. It is in
    our best interests to leave the mail hosted by the remote service and then
    downloaded to Exchange.

    I talk to SBC, they point me to ReadyHosting. I call ReadyHosting, they
    point me to SBC. I don't know who wins in this contest but I sure know it
    isn't me, the customer.

    Can anyone help point me towards a solution?


    Paul P
    Paul Proefrock, Aug 23, 2004
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  2. We use our ISP's mail server as a smarthost to relay our mail. After several
    months of usage in that configuration, we have not had any mail blocked -
    even though our IP is on the RBL's for Dynamic Residential networks.

    With RoadRunner Cable, we are authenticated to relay through their SMTP
    server because of Modem registration, so we do not need to to use a mail
    account to authenticate on their server. In some situations you would have
    to use a mail account to authenticate.
    Steve Bruce, mct, Aug 23, 2004
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  3. Merv Porter [SBS-MVP], Aug 24, 2004
  4. Merv,
    Thanks for the link. Looks like SmartHost is my only resolution. Lack of
    control is not a big issue, my host does a pretty good job.

    Have you ever run into any issues of relay or forwarding and mail not
    getting accepted using SmartHost? Some of our customers are on RoadRunner
    and they seem to dislike anything like this

    Paul P

    Paul Proefrock, Aug 24, 2004
  5. I haven't had any problems with smarthosts but maybe there's something
    specific to Roadrunner.

    SMTP SmartHosting (talks about Roadrunner a little)

    Merv Porter [SBS MVP]

    Merv Porter [SBS-MVP], Aug 24, 2004
  6. To add to Merv's comments...

    Most of the time I use Smarthosts. In my home the server uses Comcast as a
    smarthost for almost 2yrs now and I have never had a problem. Remember that
    a smarthost is the same time John Doe has to do to send mail using
    stand-alone Outlook or Outlook Express.

    Bottomline-> You will have problems with Smarthost if and only if your ISP
    is crappy... which doesn't look like is your case.

    Having said that, if your really want to use DNS... you still have one
    option. Your problem appears that your ISP is willing to relay DNS
    resolution for your IP block, but you don't have anyone to host them for
    you. The solution is simply to get someone to do this for you. I know that
    many DNS hosting companies do this... for example (never tried
    this particular service, but I have very good experiences with them). You
    will have to contact the DNS service of your choice and ask them what you
    need to do to setup PTR records and they will tell you to contact SBC and
    ask them to register them for the appropiate netblock.

    Be aware that this only works if you have more than a couple of IP
    addresses. My suggestion? Don't bother... use a smarthost :)

    Javier [SBS MVP]

    << SBS ROCKS!!! >>

    Javier Gomez [SBS MVP], Aug 24, 2004
  7. Javier and all,
    Thanks for your help. I was following the suggestions of the books (Windows
    Small Business Server 2003 and WSBS Best Practices). They led me to believe
    that DNS was the preferred connection.

    Once I followed your suggestions, problems cleared up. Javier's explanation
    help me to understand that SmartHost really is no different than what we had
    been using with OutLook in our peer to peer setup


    Paul P
    Paul Proefrock, Aug 24, 2004
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