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Blocked or Allowed Senders refers to lists in Outlook:

a) Blocked senders and domains
b) Allowed senders and domains 

that allow you to block unwanted senders, or allow senders through that are being actively blocked by the Microsoft Quarantine Filter

Option One - Blocked or Allowed Senders

Step 1: Log into the Outlook Web Application (OWA)

Sign in with your UCCS email address and password

Step 2: Click the Settings icon

Step 3: Type Blocked senders and domains in the search bar

Step 4: Manage the Block or Allow list

Option Two - Mark as Junk or Not Junk

Step 1: Log into the Outlook Web Application (OWA)

Sign in with your UCCS email address and password

Step 2: Right-click the Junk email

When you right-click on the message you would like to mark as junk, a menu will come up with various options. Select Mark as junk or Mark as Not junk.

Step 3 (Optional): View Safe or Blocked Sender

You may go back to the Blocked safe senders and domains settings to see that the sender has been added to the Blocked Senders list.