The "cookie-mismatch" warning using EDNS Compliance Tester

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    Simon Hewitt

    I can't find any details regarding #PPPM-10030. Can you please provide further information.

    My ISP uses PleskDns and because of this cookie-mismatch problem, emails sent by me to a recipient on a domain hosted by names.co.uk are rejected because of the way they do mailer validation - the EDNS Compliance Tester says NS lookup failed.

    I am not an expert on this and don't know for certain if this is the same issue or not but if it is then it is a bigger problem than just a Warning that might slow DNS accesses down!

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    Denis Bykov

    @Simon Hewitt

    The issue was resolved by upgrading BIND version shipped by Plesk in one of the updates for Plesk Onyx 17.8.
    You can refer to the following guides to update Plesk, and the error will go away:
    https://support.plesk.com/hc/en-us/articles/213408749
    https://support.plesk.com/hc/en-us/articles/213385609

    In case you already have Plesk updated to the latest version, please contact general Plesk support for a direct investigation.

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    Simon Hewitt

    I'm not sure what version of Plesk my ISP is running but I think it v12 which I see has reached end-of-life.

    Does that mean that all ISPs running Plesk v12 are running a version of Bind that is non-EDNS compliant, there is no upgrade for it, and can therefore result in emails not being received if the receiver checks for EDNS compliance?

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    Nikita Nikushkin

    Hello @Simon Hewitt,

    > Does that mean that all ISPs running Plesk v12 are running a version of Bind that is non-EDNS compliant, there is no upgrade for it

    BIND upgrade is not supported by Plesk. As a workaround, it is possible to use Microsoft DNS server instead.

    > and can therefore result in emails not being received if the receiver checks for EDNS compliance?

    Yes, such probability exists

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