Does cPanel DNSOnly block outgoing emails by default?

RuneServer

• June 13, 2026 17:01
• Edited

Hi friends!,

I have 3 servers running AlmaLinux 9, cPanel DNSOnly, and CSF that are not sending emails (for example, CSF should send a notification when someone logs in via SSH).

As far as I can tell, everything is configured correctly:

1. Port 25 is open in CSF
2. Exim is running properly
3. Added "root: email@domain.com" to "/etc/aliases"
4. Etc.

With the same kind of configuration on other servers that only run AlmaLinux 9 and CSF (using Postfix + Mailx), everything works fine. However, after installing cPanel DNSOnly (which uses Exim), even the most basic tests fail:

echo "My message" | mail -s "My subject" email@example.com

 

My question is: does cPanel DNSOnly block outgoing email by default because it is a limited version of the software, or is there some specific configuration that must be enabled? Has anyone experienced the same issue?

 

Thank you very much, and have a great day!

 

• 

  quietFinn

  • June 13, 2026 18:44

  What do you see in /var/log/exim_mainlog when you send that test message?
  
  

   

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