• 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.

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  1. H

    SPF, DKIM, DMARC, DomainKeys OK, emails flagged as SPAM

    Another update on the issue ... one of the differences between DKIM "on" and DKIM "off" is the Message-ID field in the headers; as pointed out before, onlinehome-server.info has a bad reputation and if it appears anywhere in the email headers, spam filters pick it up. I just tested it with...
  2. H

    SPF, DKIM, DMARC, DomainKeys OK, emails flagged as SPAM

    @trialotto I have no intention to pretend I brought anything new here, only to tell others how I fixed my issues (since they seem similar to the original question). And to save them a lot of frustration, like the one I experienced until I got everything working OK. In addition to the above...
  3. H

    SPF, DKIM, DMARC, DomainKeys OK, emails flagged as SPAM

    I had the same problem with a domain hosted at 1and1 ... the problem lies in the reverse DNS setting. The onlinehome-server.info is blacklisted by almost everybody, so you need to make sure the reverse DNS points to your domain. Here is the link for 1and1 how to set things right...
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