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att.net blocking my users

Discussion in 'E-mail Discussions' started by zubuz, Aug 28, 2008.

  1. zubuz

    zubuz Member

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    My users are beginning to complain that their e-mails to att.net and associated domains (bellsouth.net, sbcglobal.net, etc.) are being blocked, with a bounce message as follows:

    A message that you sent could not be delivered to one or more of its
    recipients. This is a permanent error. The following address(es) failed:

    ******@bellsouth.net
    SMTP error from remote mail server after initial connection:
    host gateway-f1.isp.att.net [204.127.217.16]:
    550-66.***.***.*** blocked by ldap:eek:u=rblmx,dc=att,dc=net
    550 Error - Blocked for abuse. See http://att.net/blocks


    This has happened two or three times in the last few months. AT&T is no help at all.

    When you go to att.net/blocks, you can request removal, certifying that you've taken one of the following steps:

    Reinstalled Antivirus and Firewall - Removed viruses
    ACL to block egress SMTP traffic was created
    Removed/blocked machine from network
    Removed vulnerable script from webserver
    Removed malicious user from network
    Reconfigured server to ignore NDRs to forged addresses/domains
    Other

    We're not virus-infected. We use ACL-based spam filtering, inbound and outbound, and there are no vulnerable scripts or malicious users on our network.

    Could my server be sending NDRs based on forged addresses? How would I check if non-deliveries are getting sent?
     
  2. Babylon

    Babylon Member

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    Ditto this question!

    Sometimes my server bounces back spam email it receives, even though the original email was just from a forged address/etc. Does anyone have tips on how to configure this better?
     
  3. Galaxy-Hosts

    Galaxy-Hosts Member

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    I have the same question. How do you configure a server to ignore NDRs to an invalid domain? If I find a way to do that before someone posts back I will update the thread.
     
  4. acenetgeorge

    acenetgeorge Well-Known Member
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  5. sneader

    sneader Well-Known Member

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  6. nickwills28

    nickwills28 Registered

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    Stay away from ATT

    Clearly, their spam filters (and the company as a whole) suck. Big time. I almost got to the point where I can't hear any more bad news from ATT.
    I have dumped every service I had with them (including their "Free" email) long ago, and advising all my friends to do so.
    I usually don't post on forums but this morning I am getting the same 550 Error - Blocked for abuse error and driven by my "sympathy" :mad: for ATT wanted to share my thoughts.
    So, stay away from them, world would be a much better place.
     
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