DKIM for dnsonly hostname

Benito

• December 02, 2025 00:58

Hello! I don’t know why one of the DNSOnly servers in my cluster isn’t signing emails with DKIM. Is there a way to enable that? I don’t see the “Email Deliverability” option on DNSOnly servers like on full servers.

Thanks

• 

  mtindor

  • December 02, 2025 16:44

  https://support.cpanel.net/hc/en-us/community/posts/19636805265815--CPANEL-20425-DKIM-for-main-server-hostname

  -- look at the 5th post, by cPanelMichael

   

  If your DNSOnly server doesn't handle DNS for the primary domain associated with your server, you will then need to publish the new DKIM key to the authoritative DNS servers for your domain.

  Example:

  domain:  example.com

  server name:  server.example.com

  When you follow the instructions in the link, a DKIM record should be added to /var/named/server.example.com

  IF your server itself is not authoritative for example.com but some other server is, copy the DKIM key and publish it in your authoritative nameservers.  It would be something like:

  To publish it in the DNS zone of your domain (example.com), you would need to add it like this:

  default._domainkey.server.example.com.    IN    TXT  "v=DKIM1; blahblahblahblah"

   

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• 

  cPRex Jurassic Moderator

  • December 02, 2025 17:06

  Hey hey!  Currently there is not a way to get DKIM working on a DNSOnly machine.  I found an older thread where I talked about a case being created:

  https://support.cpanel.net/hc/en-us/community/posts/19133314947223-DKIM-on-DNSONLY

  but that hasn't seen any action.

  I've reached out to that particular team to see if we can give that priority as DKIM is now more critical than ever.

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• 

  Benito

  • December 03, 2025 12:50
  • Edited

  Yes, nowadays it’s essential for emails to reach their destination. Thanks for the tips, but the steps to enable DKIM seemed very complicated to me. I finally solved it like this.

  I edited this file...

  /etc/exim.conf.localopts

  ...edited these lines inside it,

  smarthost: mailhost.com
  smarthost_port: 587
  smarthost_user: something@email.com
  smarthost_pass: PASSWORD

  ...then ran these commands.

  /scripts/buildeximconf
  systemctl restart exim

  And that’s it, now the DNSONLY server sends emails using a valid email account. I just hope an update doesn’t wipe out my changes.

  It would be great if all cPanel servers, including full servers, allowed configuring an SMTP in web Interface to send the server’s own emails.

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• 

  cPRex Jurassic Moderator

  • December 04, 2025 03:36

  If you edited localopts it *shouldn't* get wiped out from an update, but I'm hoping for more official DKIM support in DNSOnly in the future through that case.

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