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 does the domain owner get feedback about these checks? This is where DMARC URIs come in. Let’s break it down.

What is a DMARC URI?

A DMARC URI is a kind of address that a domain owner sets up to receive reports about DMARC checks. URI stands for Uniform Resource Identifier, which is a fancy way of saying ‘address for a resource on the internet’. In the case of DMARC, the ‘resource’ is the destination for the DMARC reports.

How Does a DMARC URI Work?

The domain owner can set up a list of DMARC URIs where they want to receive reports. When an email receiver does a DMARC check, it normally sends a report to each URI in the list, in the order they’re listed.

The email receiver might limit the number of URIs it sends reports to, but it should be able to send reports to at least two URIs. The URIs in the list are separated by commas.

What if There’s a Maximum Size for the Report?

Each DMARC URI can have a maximum size for the report that can be sent to it. This is indicated by adding an exclamation point (!) and the maximum size before the comma that separates it from the next URI.

For example, the URI “mailto:[email protected]!50m” would mean ‘send the report by email to [email protected], but only if the report is no bigger than 50 megabytes’.

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 what a DMARC URI is and how it works.

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