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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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