...
Introduction
At the beginning of some emails will be a banner at the top with a message that reads “You don't often get email from … Learn why this is important.” This is called a safety tip, and it is added to certain emails by Microsoft in order to raise your suspicions of a new sender’s email address.
Why is it important?
This adds an extra layer of security protection against potential impersonation attacks. It’s a way to create awareness and put the recipient on their guard.
...
It may also be an email address that is legitimate, but it should at least make you double check the sender to ensure it is safe.
How does it look?
Single Recipient:
...
If the majority of recipients have never or don't often receive messages from the sender, then the affected recipients will receive the tip. It’ll look the same as if it was sent to one person, except the beginning of the tip will say “Some people who received this message....”
...
When will I see the safety tip?
...
The email could be legitimate or malicious. This includes marketing emails, spam emails, or even scam ones.
How does it know if this sender is a new/infrequent sender?
...
Right click on the contact
Click on Add to Outlook Contacts
Fill in the contact details
Click on Save & Close
How can I report a suspicious email?
...