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URGENT: I seem to be blacklisted, but not on any blacklist sites i have checked

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  • URGENT: I seem to be blacklisted, but not on any blacklist sites i have checked

    all of a sudden this AM a few users are getting NDRs for certain domains. The exact NDR is:

    Your message did not reach some or all of the intended recipients.

    Subject: blah blah
    Sent: 10/15/2008 9:23 AM

    The following recipient(s) could not be reached:

    'Person's Namet' on 10/15/2008 9:23 AM
    You do not have permission to send to this recipient. For assistance, contact your system administrator.
    <mail.domain.com #5.7.1 smtp;550 5.7.1 Requested action not taken: message refused>

    Also got this one which blatantly says we are blacklisted, but after checking the list THEy give link to we ARE NOT even on the list.

    The following recipient(s) could not be reached:

    [email protected] on 10/15/2008 9:43 AM
    The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
    <mail.domain.com #5.3.0 smtp;553 5.3.0 nlpi094 - m9FDhHIm014539, DNSBL:521< xx.xx.xxx.xxx >_is_blocked.__For_information_see_http://att.net/blocks>


    I have searched all of the blacklist sites I can think of and we are not listed on any of them. Also I tried senderbase.org and our volume is up 186% for today which tells me something is shooting off our exchange server. I can't figure who it is (IP) in our company. Any ideas?

  • #2
    Re: URGENT: I seem to be blacklisted, but not on any blacklist sites i have checked

    That ISP operates their own internal blacklists, so you may not be listed on the public ones.

    I draw your attention to my blog posting on this subject.
    http://www.sembee.co.uk/archive/2008/03/13/73.aspx

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

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