Mark a Message as Spam

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Log into the SAU Spam Firewall web interface at https://admin.protection.outlook.com/Quarantine/?wa=wsignin1.0
Click the Preferences tab
Under the Blocked Email Addresses and Domains (Blacklist) header enter the sender (e-mail address) to be blocked
- NOTE: Entire domains can be blocked by typing the domain only (mail.com) - keep in mind that all senders from this domain will be blocked. This may not be a good idea for something like hotmail.com
Click Add