Do you have a legit inbound sender that constantly ends up in your users’ spam folders?
Preferably, you should check the mail header first, to see if the sender has configuration errors in DKIM or SPF. If that’s the case, contact the sender and request a fix.
Otherwise, add the sender to your inbound sender whitelist to solve this issue.
How to Add a Sender to the Office 365 Whitelist
Whitelisting senders is one of those settings that keep moving around in the Office 365 web console management circus.
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Step-by-step Guide to Whitelist Sender
To access and configure the Office 365 whitelist open up the Office 365 Security Center, aka Microsoft 365 Defender.
(you can also click Security in the Microsoft 365 Admin Center).
From there, select Policies & rules and click Threat policies:
Then select Anti-spam:
Then double click Anti-spam inbound policy (Default):
On the right side, scroll to the bottom and select Edit allowed and blocked senders and domains:
On the right hand side, click Manage n sender(s)
Click + Add senders
Type the name and click the entry under the text box to add the sender to your list:
The sender(s) you enter should appear in the web interface like so:
Then click “Add Senders”, “Done”, and “Save” to commit your changes.
The new setting may take some time to commit to the relevant cloud infrastructure.
But eventually, emails sent from the new entry in your whitelist will start to be delivered successfully.
Again, another setting that has become web interface galore.
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