Exchange 2003 smtp relay

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From: CoolD (CoolD_at_discussions.microsoft.com)
Date: 02/15/05

  • Next message: Lanwench [MVP - Exchange]: "Re: Exchange 2003 smtp relay" 
    Date: Mon, 14 Feb 2005 19:23:02 -0800

    My Exchange 2003 Server cant send email to some email servers. Here is a
    sample NDR error message.

    There was a SMTP communication problem with the recipient's email server.
    Please contact your system administrator.
    <execunets.com #5.5.0 smtp;550 You are not allowed to send mail. Please
    refer to www.spamhaus.org, dsbl.org and njabl.org for more information.>

    I can tell from this message that my server is DNS blacklisted. I can not
    get my server off of the blacklists because my ISP who has issued the static
    IPs for our mail server are not skilled enough to keep their subnets off of
    blacklists. My ISP will also not allow me to relay through their SMTP server.

    I also try to send email to some mail servers that are not using spam
    protection and the email never arrives either, but they only return delay
    messages.

    I have another client with an Exchange 2003 server that I would like to use
    as a outgoing mail relay so that it will mask my servers blacklisted IP
    address and I will be able to send mail to the internet succesfully. I have
    total control over both servers.

    The problem is that I cant get it to relay properly. On my clients relay
    server, I configured the SMTP virtual server to allow my severs Public IP to
    relay. On My own server, I configured the SMTP connector to forward all email
    through my clients server

    The email seems to get stuck in the SMTP connectors queue on my server.

    Please point me in the correct direction.

  • Next message: Lanwench [MVP - Exchange]: "Re: Exchange 2003 smtp relay"

    Relevant Pages

    • RE: "You do not have permission to send to this recipient"
      ... I have the "Allow all computers which successfully authenticate ... Authenticated computers not allowed to relay ... Expand the container that is for your Exchange server. ... Expand the "SMTP" container. ...
      (microsoft.public.windows.server.sbs)
    • RE: email, exchange server
      ... Thank you for posting in the SBS newsgroup. ... mail.alphaschool.org to relay email from yahoo? ... Right click Small Business SMTP Connector> Properties ... server with same settings. ...
      (microsoft.public.windows.server.sbs)
    • Re: Exchange issues
      ... Are you up to date on all your Service Packs, both Windows and Exchange? ... > all traffic on port 25 to the SBS Exhange server. ... I suspected SMTP relaying becuase ... > You should verify that the server really isn't an open relay: ...
      (microsoft.public.exchange2000.admin)
    • RE: #5.5.0 smtp;554 No relaying allowed - psmtp>
      ... it seems that you follow all mail to an existing SMTP server. ... If the Allow all computers which successfully authenticate to relay ... Proxy service on the Watchguard Firebox. ...
      (microsoft.public.windows.server.sbs)
    • Re: Relay Question
      ... An open relay ... is an SMTP e-mail server that allows third-party relay of e-mail messages. ... Exchange 2003 is by default configured to prevent open relay. ...
      (microsoft.public.windows.server.sbs)