Add a DMARC record to your domain in cPanel

What is DMARC?

According to dmarc.org :

DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication, policy, and reporting protocol. It builds on the widely deployed SPF and DKIM protocols, adding linkage to the author (“From:”) domain name, published policies for recipient handling of authentication failures, and reporting from receivers to senders, to improve and monitor protection of the domain from fraudulent email.

DMARC is a policy with which the sender indicates the message is protected by DKIM and /or SPF. It also tells the receiver what to do with the message if DKIM/SPF authentication fails.

Please check the DMARC resources (from the end of this article) before creating a DMARC record. You can use an online tool to create a DMARC record. Check the DMARC Tools page.

To set a DMARC record for your domain:

  1. Log into cPanel
  2. Navigate to Zone Editor (DOMAINS section)
  3. On the row with the desired domain, click the Manage link
  4. Click the down arrow cpanel dmarc2  from the right of the Add Record button.
  5. Select Add DMARC Record from the drop-down list
  6. Modify any DMARC settings (see below) and click the Add Record button
cPanel DMARC
cPanel DMARC

DMARC Settings

PolicyAction
NoneNo action is taken; you can use this setting to monitor DMARC
QuarantineMessages will be marked as spam
RejectMessages will be rejected
ParameterSettings
Subdomain PolicyAction for subdomain policy. Same options as for the main domain policy.
DKIM ModeRelaxed – the system allows some messages from domains that it doesn’t recognize.
Strict – the system will reject all messages from domains that it doesn’t recognize.
SPF ModeRelaxed – the system allows some messages from senders that it doesn’t recognize.
Strict – the system will reject all messages from senders that it doesn’t recognize.
PercentageDefault value is 100. It represents the percentage of the email messages you want the system to filter.
Generate Failure Reports WhenAll Checks Fail – report will be send if all checks fail
Any Checks Fail – report will be send if any checks fail
Report FormatAFRF – Authentication Failure Reporting Format
IODEF – Incident Object Description Exchange Format
Report IntervalThe time in seconds between each aggregate email message report. The default value is 86400 (24 hours).

The video tutorial for setting a DMARC record:

cPanel DMARC record

If you’ve added a valid email for the Send Aggregate Mail Reports To, you will receive a message from receivers that support DMARC, like in the example bellow:

From: noreply@dmarc.yahoo.com
To: admin@plothost.com
Subject: Report Domain: plothost.com Submitter: yahoo.com Report-ID: <1496110592.916792>
In the attachment you will see an XML file with the same name as the zip archive.

<?xml version="1.0"?>	
<feedback>	
  <report_metadata>	
    <org_name>Yahoo! Inc.</org_name>	
    <email>postmaster@dmarc.yahoo.com</email>	
    <report_id>1496110592.916792</report_id>	
    <date_range>	
      <begin>1496016000</begin>	
      <end>1496102399 </end>	
    </date_range>	
  </report_metadata>	
  <policy_published>	
    <domain>plothost.com</domain>	
    <adkim>r</adkim>	
    <aspf>r</aspf>	
    <p>none</p>	
    <pct>100</pct>	
  </policy_published>	
  <record>	
    <row>	
      <source_ip>d02.plothost.com</source_ip>	
      <count>1</count>	
      <policy_evaluated>	
        <disposition>none</disposition>	
        <dkim>fail</dkim>	
        <spf>fail</spf>	
      </policy_evaluated>	
    </row>	
    <identifiers>	
      <header_from>plothost.com</header_from>	
    </identifiers>	
    <auth_results>	
      <dkim>	
        <domain>web.plothost.com</domain>	
        <result>neutral</result>	
      </dkim>	
      <spf>	
        <domain>web.plothost.com</domain>	
        <result>none</result>	
      </spf>	
    </auth_results>	
  </record>	
</feedback>		

Resources:
DMARC Website at https://dmarc.org/overview/
DMARC Tools – record creation, lookup, check etc.
Google recommendations for DMARC here
cPanel Zone Editor Documentation

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