Incoming mail to Plesk server is rejected by Spamhaus BL: Error: open resolver

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9 comments

  • Avatar
    musti19

    cbl.abuseat.org also uses spamhaus.org, see the error message:

    blocked using cbl.abuseat.org; Error: open resolver; https://check.spamhaus.org/returnc/

    after disabling cbl.abuseat.org too, incoming mails are now working

    1
  • Avatar
    Johannes Gmelin (Edited )

    Man, I was looking for the issue since hours. You are a lifesaver! I hope you know that. One thing thats different regarding your answer because I am using the Hetzner DNS Console:

    root@plesk ~ # cat /etc/resolv.conf

    nameserver 127.0.0.53
    options edns0 trust-ad
    search .

    Any idea how to fix it using the Hetzner console? I will contact Hetzner anyway and update my comment if I find something.

    1
  • Avatar
    Johannes Gmelin

    Update: Hetzner is aware of the problem and is currently trying to figure out how to fix it. I will keep you updated. I would suggest removing the Spamhouse check from the list until Hetzner fixed the error on their side because when using the Hetzner DNS via localhost:53, it's not in our hand to fix it. If you are using 1.1.1.1 or 8.8.8.8 it's your task.

    1
  • Avatar
    Johannes Gmelin (Edited )

    Hetzner told me to change to Spamhaus DQS which I did but I still get a rejection error:

    NOQUEUE: reject: RCPT from unlisted.blt.spamhaus.net[199.168.89.101]: 554 5.7.1 Service unavailable; Client host [199.168.89.101] blocked using cbl.abuseat.org; Error: open resolver; https://check.spamhaus.org/returnc/pub/2a01:4f8:0:a104::add:1d/; from=<probe@unlisted.blt.spamhaus.net> to=<info@xxx.de> proto=ESMTP helo=<unlisted.blt.spamhaus.net>

    1
  • Avatar
    Gilson Siqueira

    Johannes Gmelin cbl.abuseat.org also uses spamhaus.org; it is advised to remove it too, prefer using the ones recommended on solution 3: dnsbl.info; spamcop.net; spam.abuse.net

    -1
  • Avatar
    musti19

    Gilson, why you dont publish my comment and advise him after few days, the same what i said already??

    0
  • Avatar
    Gilson Siqueira

    musti19 I'm checking that; your comment is pending approval and I'm checking how to approve it. When your comment is published I'm happy to remove mine.

    0
  • Avatar
    Voelu28

    I'm using Spamhaus within the Plesk Email Security Extension without any problems. 
    Is it affected too?

    I'm not using DNS-Backhole-Lists under the Mail Server Settings.

    0
  • Avatar
    Gilson Siqueira (Edited )

    Voelu28 it is supposed to be affected too if you use Hetzner DNS resolvers, or any other open resolvers in your server (hint: /etc/resolv.conf), because it is implemented internally in the same way as the option in tools & settings. But if email traffic is flowing there is no reason to worry, and your server is not being affected. Feel free to open a ticket in case you want to double check with our team!

    0

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