Questions about DMARC policies on additional domains in my O365 account that are not configured for sending.
Is the best practice to set the non-sending domains to Reject in DMARC? And primary (ie sending domain to none with goal to move to Quarantine or reject over time).
Main corporate domain email is tied to: www.maincorp[dot com]
Email: [email protected][dot com]
Configured for DKIM, SPF and DMARC set to none with reporting.
We then have 10-15 additional domain names configured in O365.
That said, we do not send from any of the additional but a few receive
Add Domain: www.main-corp[dot com]com
(email set as alias to primary email: [email protected][dot com] really resolves to [email protected][dotcom])
Add Domain: www.maincorpUSA[dot com]
Currently all additional domains have same DMARC policy of None and reporting email and we get a few reports of spoofed emails from some of the non-sending domains.
Is the best practice to set the non-sending domains to Reject in DMARC?
Welcome to the Cloudflare Community.
Configuring DNS records that communicate to recipients that certain domains should never send email is a good practice to employ. Here is a Cloudflare resource and a third party guide that are relevant to your question.
Thx Epic Network, will get eyes on that.
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