Office 365 Free DMARC

Microsoft shared an Office 365 Free DMARC solution a few days ago, with a partnership with ValiMail. You can subscribe to the service on this link.

You can read the complete announcement there.

I found it to be an excellent news to be able to get some DMARC insights free of charges, so I tried it, hereunder my firsts impressions.


First, you need to subscribe to the service on ValiMail’s site.

Valimail subscribe form

Then, you’ll receive an email with the instructions (it took ~2 days for me, maybe caused by a huge load since the announcement).

Basically, you’ll need to create a “_dmarc” subdomain in your DNS registrar, and then add their name server to let ValiMail handle DMARC configuration for you.

Note: You may want your security team to review this before implementing into production.

Once the new DNS record is detected by ValiMail, they will send you your credentials to access your ValiMail dashboard to access your statistics.


If you have a look at your DMARC, you’ll see something like this:

Office 365 Free DMARC – DMARC record

Valimail will manage this for you, you won’t have to learn the DMARC DNS specifications.

As soon as you accept the invitation to access your Valimail dashboard, you’ll be asked to create a password for your account, and then you’ll be able to see the DMARC reports.

Based on the harvested data, Valimail will allow you to deploy SPF/DKIM records that matches your deployment.

Leave a Reply

Your email address will not be published.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

This site uses Akismet to reduce spam. Learn how your comment data is processed.