CentOS 8.x Control Web panel Enable DKIM for a Domain

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How to Enable DKIM for a Domain in CWP (Control Web Panel)

Log in to the CWP Admin Panel

Access the panel using: 

 
http://<your-server-ip>:2030 
https://<your-server-ip>:2031 # (for SSL)

Login using your admin credentials.

2: Open Mail Server Manager

From the left sidebar, navigate to: 

Email → MailServer Manager

3: Ensure DKIM Support is Enabled

  • Make sure Postfix is installed and running.
  • Ensure OpenDKIM is installed and active.
  • If not installed:

Go to: 

Email → MailServer Manager → Rebuild Mail Server

Install/enable the DKIM support during rebuild.

4: Generate DKIM Keys for the Domain

  • Navigate to:
 
Email → DKIM Manager
  • Select your domain from the dropdown.
  • Click on Add DKIM

This will:

Generate a public/private key pair

Auto-configure OpenDKIM/Postfix for the selected domain

Add the DKIM TXT Record to DNS

After generating, a TXT record will be displayed.

Go to your DNS zone editor (e.g., CWP DNS, Cloudflare, GoDaddy, etc.)

Add a new TXT record with the following: 

 
Name (Host): default._domainkey Type: TXT Value: (copy the full value from DKIM Manager)

Verify DKIM Configuration

Wait for DNS propagation (usually a few minutes to hours). Then:

Use tools like mxtoolbox and verify the DKIM signature.

Or send an email to a Gmail account, click Show original, and look for: 

 
DKIM: PASS

Restart Services (Optional)

If DKIM isn’t working immediately, try restarting the services: 

 
systemctl restart opendkim 
systemctl restart postfix


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