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How to enable DKIM spam protection for outgoing emails of particular domain in Plesk

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Alexander Tsmokalyuk
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Applicable to:

  • Plesk for Linux
  • Plesk for Windows

Question

How to enable DKIM spam protection for outgoing emails of particular domain in Plesk?

Answer

Note: if external DNS provider is used, contact your DNS owner in order to add DKIM record. Refer to this instruction for DKIM public key.

1. Enable DKIM support server-wide

2. Enable DKIM protection for particular domain:

  • via Graphical User Interface (GUI):

    1. Log into Plesk

    2. Go to Domains > example.com > Mail Settings, mark Use DKIM spam protection system to sign outgoing email messages and press OK:

      Screenshot_3.png

  • via Command Line Interface (CLI):

    • for Linux:

      1. Connect to Plesk server via SSH.

      2. Run the command:

        # /usr/local/psa/bin/domain_pref --update example.com -sign_outgoing_mail true

    • For Windows:

      1. Connect to Plesk server via RDP.

      2. Run the command:

        C:\> "%plesk_cli%\domain_pref.exe" --update example.com -sign_outgoing_mail true

 

Additional Information

Comments

6 comments

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    Iain

    What is not mentioned is how you obtain the public key to publish in DNS. The article does mention; "if external DNS provider is used, contact your DNS owner in order to add DKIM record" ... but it would help to know what the public key is to add :-)

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    Ivan Postnikov

    Hello Iain

    This instruction contains an answer to your question.

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    Iain

    Thanks Ivan Postnikov. Indeed I found and used that article, but it would be worth including at least a link this this in the main article here as you can't enable DKIM without publishing the selector key and so it really needs to be a part of the solution :-)

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    Ivan Postnikov

    Hello Iain

    Thank you for clarification.

    I've added the corresponding link.

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    Kathy Sechrist

    I have a serious problem.
    I'm on Obsidian 18.0.29 Update 2

    I have several domains under the same subscription. I set up DKIM for all of them.

    They work fine when sending email from an email client.

    But when I send an email using PHP from any domain other than the first one I added to this subscription, it fails with the error "DKIM: Fail with domain: (primary domain)"

    How do I get PHP to send as the right domain and use the right DKIM?

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    Ivan Postnikov

    Hello Kathy Sechrist

    As I can see, you've already found the article https://support.plesk.com/hc/en-us/articles/115002513925 and left an additional question there.

    We'll check that additional question.

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