Spam email received with empty <> Sender address. How do we block this?

Question

Hello everyone,

I have this issue where spam email recieved from an empty email address with <> like the below screenshot:

I have tried creating a new rule to detect "<>" from the sender address and block it. The rule is not working.

Let me know if you have any feedback or advice,

Thank you!

Regards,

Answer 1

Hi @ Said A ,

Please refer to the following two conditional setting mail flow rules to see if you can block messages with empty sender addresses:

 

1. Delete messages whose sender address matches “<>” or “space” characters:

 

2. Delete all messages from outside your organization, except for the sender address that matches the "@" character.

 

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Answer 2

I would submit that as junk to Microsoft from the explorer Email entity menu: