@smeehan

I’d recommend taking a look at the following guide:

https://www.skelleton.net/2015/03/21/how-to-eliminate-spam-and-protect-your-name-with-dmarc/

Deploying DMARC can be anything from a 2 min. task, to a project taking years to complete, depending on the size and complexity of your organization.

If you can provide more detail, more specific advice can be given.

I followed the steps at https://dmarcguide.globalcyberalliance.org, it asks questions and gives you the value for your TXT record. When I tested it, it said it worked… so I guess it did!

Take a look at this comprehensive guide to implementing DMARC/DKIM/SPF: How to implement DMARC/DKIM/SPF to stop email spoofing and phishing.

It provides step-by-step instructions and explains how DMARC, DKIM, and SPF work to achieve effective email authentication.