How to fix dmarc policy none on BigCommerce

Steps for BigCommerce

1. BigCommerce does not control DNS. Navigate to your domain registrar or DNS host's control panel.
2. Locate the TXT record named _dmarc for your store domain.
3. Edit the value to change p=none to p=quarantine. Save and allow propagation (up to 48 hours).
4. BigCommerce sends transactional emails via its own infrastructure. In BigCommerce Admin > Store Setup > Email, confirm the From address domain matches your domain, and verify your SPF record includes BigCommerce's sending IPs (check their Help Center for current SPF include values).
5. Review aggregate reports, then edit the _dmarc record a final time to set p=reject.

; Step 1 – current state (monitor only — fix this)
v=DMARC1; p=none; rua=mailto:dmarc-reports@yourdomain.com;

; Step 2 – intermediate enforcement (quarantine)
v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc-reports@yourdomain.com;

; Step 3 – full enforcement (target state)
v=DMARC1; p=reject; pct=100; rua=mailto:dmarc-reports@yourdomain.com;

What is dmarc policy none?

DMARC (Domain-based Message Authentication, Reporting & Conformance) is a DNS record that tells receiving mail servers what to do with emails that claim to come from your domain but fail authentication checks. A policy of p=none means "do nothing — just watch." It is a starting point for monitoring, not a finished protection. Until you move to p=quarantine or p=reject, anyone on the internet can send phishing or fraud emails that appear to come from your store's domain and mail servers will deliver them without question.

With p=none in place, criminals can impersonate your brand in phishing emails to your customers, suppliers, or staff — and those emails will land in inboxes rather than spam folders. A successful phishing campaign erodes customer trust, can trigger payment fraud chargebacks, and may expose you to legal liability. Google and Yahoo's 2024 bulk-sender requirements made a published DMARC policy a deliverability prerequisite, so staying at p=none also risks your legitimate marketing and transactional emails being filtered or rejected. Moving to p=reject is the only setting that fully closes the spoofing window.

See the complete Dmarc policy none guide for every platform and the full background.