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Validate the external sender in Office365

%3CLINGO-SUB%20id%3D%22lingo-sub-914959%22%20slang%3D%22en-US%22%3EValidate%20the%20external%20sender%20in%20Office365%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-914959%22%20slang%3D%22en-US%22%3E%3CP%3EHi%20All%2C%26nbsp%3B%3C%2FP%3E%3CP%3EThanks%20in%20advance%2C%20I%20am%20looking%20for%20the%20steps%20where%20we%20can%20validate%20the%20sender%20based%20on%20their%20SPF%20%26amp%3B%20DMARC%20records%20in%20Office365.%20For%20example%3A%20if%20an%20email%20comes%20from%20usera%40domainb.com%20to%20our%20Office365%20tenant%20which%20actually%20hosts%20domaina.com.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3ENow%2C%20our%20Office365%20quarantines%20this%20sender%20stating%20no%20much%20detailed%20info%20available%20of%20the%20sender.%20I%20knwo%20that%20I%20can%20whitelist%20either%20the%20email%20address%20or%20the%20domain%2C%20but%20by%20doing%20so%20I%20will%20have%20no%20control%20over%20spoofed%20emails%20from%20this%20domain.%20So%2C%20I%20want%20to%20control%20receiving%20emails%20from%20this%20sender%20and%20hence%20I%20have%20collected%20SPF%20%26amp%3B%20DMARC%20records%20of%20this%20sender%2C%20but%20I%20am%20not%20aware%20of%20how%20to%20add%20these%20records%20for%20domainb.com%20in%20Office365.%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-914959%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EOffice365%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ESecurity%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
PoorMens_Bravo
New Contributor

Hi All, 

Thanks in advance, I am looking for the steps where we can validate the sender based on their SPF & DMARC records in Office365. For example: if an email comes from usera@domainb.com to our Office365 tenant which actually hosts domaina.com.

 

Now, our Office365 quarantines this sender stating no much detailed info available of the sender. I knwo that I can whitelist either the email address or the domain, but by doing so I will have no control over spoofed emails from this domain. So, I want to control receiving emails from this sender and hence I have collected SPF & DMARC records of this sender, but I am not aware of how to add these records for domainb.com in Office365.

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