SBS203 wont send email to certian domains like yahoo or hotmail

Discussion in 'Windows Small Business Server' started by Zach Anthony, Oct 30, 2006.

  1. Zach Anthony

    Zach Anthony Guest

    My SBS 2003 server has stopped relaying email to certian domains like hotmail
    or yahoo.

    Here is an example of the error msg I get:
    Your message did not reach some or all of the intended recipients.

    Subject: Test Email from SBS2003 server
    Sent: 10/30/2006 8:42 AM

    The following recipient(s) could not be reached:

    on 10/30/2006 8:42 AM
    You do not have permission to send to this recipient. For assistance,
    contact your system administrator.
    < #5.7.1 smtp;550 5.7.1 Unable to relay for

    I am using a connector to send all email via an external server, this was
    working just fine until today. If I login directly to the external server I
    am able to send email to these domains just fine.

    How do I go about fixing this problem?
    Zach Anthony, Oct 30, 2006
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  2. Zach Anthony

    David Parkes Guest

    Setup Reverse DNS.
    David Parkes, Oct 30, 2006
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  3. Zach Anthony

    Gregg Hill Guest

    When you said, "I am using a connector to send all email via an external
    server," did you mean that you send through your ISP's smarthost?

    Normally, the only reason to do that is if you are on dynamic addresses and
    cannot get a reverse DNS record set up.

    If you are using a smarthost, and it worked previously, then look up the
    smarthost itself on a site such as to see if it has a PTR
    record for itself.

    More and more domains are starting to block anything that does not have a
    PTR (reverse DNS) record, because they ASSume it means you are a spammer.
    GoDaddy started doing it a month or so ago.

    Gregg Hill
    Gregg Hill, Nov 1, 2006
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