OnDMARC

Go to your Domain List and click Manage next to the domain:

Find the Host Records section and click on the Add New Record button

Select NS Record for Type and enter the Host you would like to point to a server:

1. For Dynamic DMARC enter: _dmarc
2. For Dynamic DKIM enter: _domainkey

Enter the Value of the Name Server to point to:

1. For Dynamic DMARC enter: ns-dmarc.ondmarc.com
2. For Dynamic DKIM enter: ns-dkim.ondmarc.com

Check the Save All Changes button once done:

1. Go to your Domain List and click Manage next to the domain:
 
2. Select the Advanced DNS tab:
 
3. Find the Host Records section and click on the Add New Record button
 
4. Select NS Record for Type and enter the Host you would like to point to a server:
 1. For Dynamic DMARC enter: _dmarc
 2. For Dynamic DKIM enter: _domainkey
 
5. Enter the Value of the Name Server to point to:
 1. For Dynamic DMARC enter: ns-dmarc.ondmarc.com
 2. For Dynamic DKIM enter: ns-dkim.ondmarc.com
 
6. Check the Save All Changes button once done:

<a href="https://www.namecheap.com/support/knowledgebase/article.aspx/9776/2237/how-to-create-a-subdomain-for-my-domain/#ns" rel="nofollow noopener noreferrer" target="_blank">Create a subdomain with Namecheap</a>

Create a free OnDMARC account to test your configuration.

Instructions to create Name Server records for Dynamic DMARC with Namecheap

How to create Name Server records with Namecheap

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