Setting up Dynamic DMARC using Name Servers
Open the Route 53 console.
In the navigation pane, choose Hosted zones.
Select the hosted zone for the domain (eg: example.com).
In the hosted zone for the domain, choose Create record.
For Name, enter the name of the subdomain.
For Dynamic DMARC enter: _dmarc
For Value, enter the names of the name servers.
For Dynamic DMARC enter: ns-dmarc.ondmarc.com
For Record type, choose NS.
For TTL (Seconds), select a more common value for an NS record, such as 86400 seconds.
For Route Policy, choose Simple routing.
Choose Create Records.
Setting up Dynamic DMARC using CNAMES
Login to your Route 53 Console.
In the navigation pane, choose 'Hosted zones'.
Choose the domain that you want to add a CNAME record to.
Choose 'Create record'.
For 'Routing policy, choose Simple routing, and then choose Next.
Choose Define simple record.
In the Define simple record pane, do the following:
For Record name, Enter the following value: _dmarc
For Value/Route traffic to, paste the value you are setting as the destination of the Host: _dmarc.exampledomain.com._dmarc.smart.ondmarc.com
Note: Make sure to replace exampledomain.com within the example above with your own custom domainFor Record type, choose CNAME.
For TTL (seconds), type
1800.Choose Define simple record.
Allow up to 24 hours for propagation of the newly created record.
Setting up Dynamic DKIM using Name Servers
Open the Route 53 console.
In the navigation pane, choose Hosted zones.
Select the hosted zone for the domain (example.com).
In the hosted zone for the domain, choose Create record.
For Name, enter the name of the subdomain.
For Dynamic DKIM enter: _domainkey
For Value, enter the names of the name servers.
For Dynamic DKIM enter: ns-dkim.ondmarc.com
For Record type, choose NS.
For TTL (Seconds), select a more common value for an NS record, such as 86400 seconds.
For Route Policy, choose Simple routing.
Choose Create Records.
Create a free OnDMARC account to test your configuration.