 May ask how it works essentially When a user sends an email it exits the outbound mail server and goes to the recipients mail server The recipients mail server is going to check and see if there is a DMARC record on that sending domain in this case moderndigitaloffice.com That since there is a DMARC record the receiving mail server is going to check to see if SPF and DKIM are aligned With the sending domain in other words the in this case domain modern digital office calm has an SPF record it validates that the sending server does indeed match the SPF record and Validates that the DKIM signature that's embedded in the email matches What should be being sent by that sending mail domain? if those Are aligned then the email is delivered and if they're not aligned then the DMARC policy is applied and The DMARC policy itself can do several different things such as nothing That's one of the things that can do or quarantine the mail or reject the mail