• Please be aware: Kaspersky Anti-Virus has been deprecated
    With the upgrade to Plesk Obsidian 18.0.64, "Kaspersky Anti-Virus for Servers" will be automatically removed from the servers it is installed on. We recommend that you migrate to Sophos Anti-Virus for Servers.
  • The Horde webmail has been deprecated. Its complete removal is scheduled for April 2025. For details and recommended actions, see the Feature and Deprecation Plan.
  • We’re working on enhancing the Monitoring feature in Plesk, and we could really use your expertise! If you’re open to sharing your experiences with server and website monitoring or providing feedback, we’d love to have a one-hour online meeting with you.

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...
Back
Top