DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a way of checking that an email really was sent by the domain it claims to be from. But how do DMARC policies work? Let’s break it down.

What is a DMARC Policy?

A DMARC policy is a set of rules that a domain owner sets up to tell email receivers how to handle emails that claim to be from their domain. The domain owner publishes these rules in a DNS (Domain Name System) TXT record, which is a type of record that can hold any kind of text information.

How Does a DMARC Policy Work?

When an email receiver gets an email that claims to be from a certain domain, it checks the DNS TXT record for that domain to see if there’s a DMARC policy. If there is, the email receiver tries to follow the rules in the policy when deciding what to do with the email.

For example, the policy might say that if an email fails the DMARC check, it should be sent to the spam folder. Or it might say that the email receiver should send a report back to the domain owner about the email.

What if a Domain Owner Doesn’t Want to Use DMARC?

A domain owner can choose not to use DMARC. In this case, they simply don’t publish a DMARC policy in their DNS TXT record. This means that email receivers won’t have any special instructions to follow when they get an email that claims to be from that domain.

What if an Email Receiver Can’t Follow the DMARC Policy?

Sometimes, an email receiver might not be able to follow the DMARC policy exactly. This could be because of complicated situations like email forwarding or services that spoof the ‘From’ address in emails.

In these cases, the email receiver can deviate from the DMARC policy. But they should try to let the domain owner know about this by sending them a report that explains why they had to deviate from the policy.

Remember, this is a simplified explanation. In reality, DMARC involves a lot of complex processes and technologies. But hopefully, this gives you a basic understanding of how DMARC policies work.

Was this helpful?

0 / 0

Leave a Reply 0

Your email address will not be published. Required fields are marked *