How to configure DKIM for host server

Answered

Flyer

• March 27, 2026 13:18
• Edited

I have configured the DNS of each account to use DKIM, but am not sure how to do that for the host server.  This is needed for when WHM sends mail from root@myhostserver.com.  I know how to create the entry for its DNS, but how do I inform Exim where its private key is?

• 

  cPRex Jurassic Moderator

  • March 27, 2026 15:39

  Hey there!  We have had DKIM signatures on the hostname of the machine configured automatically since version 70.  Are you not seeing this working on your system?  Here is a message from my personal server where CSF/LFD sends a message to the root contact (root@hostname) and I see that is DKIM signed in my client:

  Return-Path: <SRS0=6fb4=b3=host.hostname.com=root@host.hostname.com>
  X-Originating-Ip: [x.x.x.x]
  Received-SPF: pass (domain of host.hostname.com designates x.x.x.x as permitted sender)
  Authentication-Results: mta.yahoo.com;
   dkim=pass header.i=@host.hostname.com header.s=default arc_overridden_status=NOT_OVERRIDDEN;

  There is also the expected large DKIM-Signature in the header.

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  Flyer

  • March 27, 2026 16:46

  Thanks for your quick response.
  
  I manage DNS manually on Azure, so have to create the DKIM record there.  I've now found the information I need under WHM's Email Deliverability and checked it works using MxToolbox.

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  cPRex Jurassic Moderator

  • March 27, 2026 16:52

  Thanks for the clarification, and I'm glad you found those details there for the hostname!

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