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somaji's avatar
somaji
Brass Contributor
Jan 13, 2023
Solved

Microsoft Defender for Email & Collaboration - "Whitelist"

We have "Whitelisted" some domains (e.g. appriver.com) by adding the domain to "Add trusted senders and domains" in the Spam policies; as well as adding a rule in Microsoft365 Exchange Mail flow Rule...
microsoft defender for office 365
  • somaji's avatar
    somaji
    Jan 16, 2023
    I do see SFV:BLK in the header.
somaji's avatar
somaji
Brass Contributor
Jan 16, 2023
I do see SFV:BLK in the header.
Ben_Harris's avatar
Ben_Harris
Icon for Microsoft rankMicrosoft
Jan 16, 2023

somaji - Perfect, in which case this text from the documentation should be of assistance. 

Filtering was skipped and the message was blocked because it was sent from an address in a user's Blocked Senders list.

For more information about how admins can manage a user's Blocked Senders list, see Configure junk email settings on Exchange Online mailboxes.

Thanks 🙂

Ben.