DMARC helps protect your email and deliverability. As described in the KB article titled What is DMARC, a DMARC record is created by adding a simple DNS TXT record. Because of that, this particular security control is not specific to any one mail service. This tutorial will help you add the DMARC TXT record to your domain.
1. Discover your DNS
Each DNS Provider has a different method for adding records. The first step is to determine who your DNS provider is if you don't already know.
a. Tap your Window key, and search for “Command Prompt.” Launch a command prompt.
b. At the command prompt, type “nslookup -type=ns youdomain.com”, replacing yourdomain.com with your actual email domain.
c. In the output, look for the “nameserver=” to determine who hosts your DNS. In the screenshot below, you’ll see that this domain has its DNS hosted by Cloudflare.
2. Add your TXT Record at your DNS Provider
Once you know who your DNS provider is and you’ve created the DMARC text based on the article “What is DMARC” you can log into your provider and create the record.
While each provider is a little different, they all have a largely similar interface. In the screenshot below, you’ll see a DMARC record added at Cloudflare
This domain is now instructing all mail servers that they should quarantine all emails that fail SPF or DKIM checks, and to send a daily forensic report over email. It's that easy!
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