I just got DMARC set up on our Namecheap domain. It was a straightforward process:
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Login to the main dashboard
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Click the Manage button next to the domain
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Click on the Advanced DNS tab
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At the bottom of the records list, click on + Add new record
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From the popup, scroll down and select TXT Record
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Fill in the new form on the right with these exact files
- Host:
_dmarc
- Value:
v=DMARC1; p=none;
- Leave Automatic selected for the TTL
- Click on the

From there, you can verify that things are working properly by sending a test email from the Shopify admin. In Gmail, you can click <> Show original on the email, and you should see something like this, confirming that it all works:
