Hi @GurudasSatardekar
Are you looking for this: Use DMARC to validate email? Please correct me if I have any misunderstanding about your question and you could provide more information here to make your question more clear. And according to my search, the Dmarc Advisor seems to be a 3rd party tool, and it's not allowed to share or recommend these information here, thanks for your understanding!
And the Best practices for implementing DMARC in Microsoft 365 introduced in this official document as well
In addition, if you are not faimilar with how to add this record, you could check the steps list below:
Follow this guide to setup a DMARC record for Office 365
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
1) Open the Admin center of Office 365
Log in to the Admin center of Office 365.
2) Select domains
From the settings menu, select domains.
3) Select Office 365 domain
In this menu you can search, select or add the desired Office 365 domain for which you want to implement DMARC.
4) Add DMARC Record
After you have selected the desired Office 365 domain, you will be pointed to a page with instructions on how your DNS setting must be setup for your Office 365 services to run smoothly.
Note: If you already see a record with name ‘_dmarc’, edit this record instead of creating a new record! This is important as you can’t have multiple DMARC records.
5) Your first DMARC reports should start dripping in after 72 hours
You should now wait some time before the first reports will start to arrive in DMARC Analyzer. This is due to DNS caching and the fact that the ISPs mostly send one report each day. This can take upto 72 hours.
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