After following the guide to create a basic DMARC record you will be able to add MTA-STS reporting and MTA-STS file hosting. 

We will host your MTA-STS policy at We will host and provision a LetsEncrypt SSL certificate on your behalf. Our company is a multi-year sponsor of the project. 

The next step will require access to your DNS so you can create TXT records. 

Once published you can validate your MTA-STS record is published by checking with this tool -