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DKIM fail sending to Office 365 and Outlook.com

Discussion in 'E-mail Discussion' started by lukekenny, Apr 12, 2019.

  1. lukekenny

    lukekenny Member

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    This is a bit of a weird one. WHM DKIM & SPF is set up correctly, and emails sent through the cPanel accounts to test services like dkimvalidator.com/ show DKIM passed. Emails sent to Gmail show DKIM passed.

    However, emails sent to Office365 Exchange accounts and Outlook.com accounts show DKIM fail.

    A sanitised example from an Office365 recipient:

    Authentication-Results: spf=pass (sender IP is 1.1.1.1)
    smtp.mailfrom=senderdomain.com.au; receivedomain.com.au; dkim=fail
    (signature did not verify)

    header.d=senderdomain.com.au;receivedomain.com.au; dmarc=pass action=none
    header.from=senderdomain.com.au;compauth=pass reason=100

    Where as the exact same test message sent to a Gmail account:

    ARC-Authentication-Results: i=1; mx.google.com;
    dkim=pass header.i=@senderdomain.com.au header.s=default header.b=uDV+6ipX;
    spf=pass (google.com: domain of website@senderdomain.com.au designates 1.1.1.1 as permitted sender) smtp.mailfrom=website@senderdomain.com.au;
    dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=senderdomain.com.au

    DMARC was enabled manually for this domain, trying to solve the problem. It doesn't make a difference if it's on or off.

    dkimvalidator.com shows DKIM passes.

    Does anyone have any idea what additional steps / configuration is required to get cPanel emails passing Microsoft's checks?
     
    #1 lukekenny, Apr 12, 2019
    Last edited by a moderator: Apr 12, 2019
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager Staff Member

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    Hello @lukekenny,

    Can you open a support ticket so we can take a closer look at the affected system to determine why DKIM verification fails when sending email to Office365/Outlook.com email servers? You can post the ticket number here and we'll link this thread to it.

    Thank you.
     
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  3. lukekenny

    lukekenny Member

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    Done.

    Your Support Request ID is: 11989379
     
    cPanelMichael likes this.
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