Validate the external sender in Office365

Occasional 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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