• The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.
  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.

dns lookup failure

  1. F

    Resolved Error code: (26) DNS lookup failure, failed SPF check - spf.trusted-forwarder.org gone?

    Hi, I noted today, that I got SPF defered messages in my mail log due to "DNS lookup failed". Example: after very extensive troubleshooting and around my DNS configuration and the SPF records of the sender domains which all looked good and healthy, I started sniffing the DNS traffic and...
  2. P

    Resolved Error code: (26) DNS lookup failure, failed SPF check for some incoming mails

    Dear all, I'm running a new Linux server with Plesk installed. Here some data: Linux: Ubuntu 20.04.3 LTS Plesk: Plesk Obsidian Version 18.0.39 Extension: Plesk Email Security Postfix Note: I use a standard installation of Ubuntu and Plesk through the hoster. So I found the following log in my...
  3. Dewan D

    Resolved Error code: (26) DNS lookup failure

    Hi Guys. I have looked through the forums but the references I found sadly did not help. Recently I have moved to a VPS with Plesk. Everything seems to be setup fine, except some emails are not coming through when the SPF Filter runs. Looking through the mail.log I have a few examples, since...
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