Office 365 – Managing Spam in Junk E-mail Folder and Block/Allow Senders Lists

The University has migrated to Office 365, along with this upgrade all Spam filtering is done by Microsoft. The new spam scanning service does not have a web accessible interface that will allow the user to control spam. Microsoft uses a sender base reputation and scores the domains. Based on these scores the domains are either blocked or known as a reputable sender. If the domain is a reputable sender then the Microsoft scans for spam and viruses and sends the email on to the user.

Please Note:

  • The solution below is not the ultimate solution for blocking spam messages. To assist the University please follow the instructions on How to forward suspect Phishing & SPAM Email Messages for Evaluation.  By doing this ITS will send the SPAM message on to Microsoft to evaluate.  This will help us to block the email in the future.
  • If you have added the sender to the Safe Senders List, and you are still not receiving the email from that sender then are mostly likely being blocked on a higher level.  Please submit a Help Request to ITS-SYSTEMS, so we may  evaluate the situation and have the sender removed if deemed appropriate.

Managing Spam or Junk Email

In order to manage spam through Office 365 Junk E-mail Folder using the Junk Filter and Block/Allow lists in Outlook Web Application (OWA). Please follow the tips and instructions below or visit  Block-or-allow-junk-email-settings Microsoft document.

Tips for Managing Spam

  1. Unsubscribe from unwanted lists
  2. Try not to add any aliases or email addresses to any subscriptions or web pages moving forward.
  3. Adding emails to the Block/Allow list in OWA or Outlook Desktop Client.
Note: The Junk Filter is available via the Outlook  2010, 2011 (Mac), 2013, 2016 (Win/Mac) Desktop Client by right clicking and choosing to Mark Spam as junk or adding sender to the block list; however using the Outlook Web Application is better because it will set the rules on the server. Some desktop clients may not update the server immediately.

Using  Junk E-mail folder and Block Senders List

In order to use the Junk Filter or Block/Allow Senders List please go to and login with and password or Outlook desktop client then follow the instructions below:

Outlook Web App (OWA)

Considered Junk

  1. Go to the folder where the email exists.
  2. Highlight an email that is considered junk.
  3. Right click the email.
  4. On the pop-up menu click on Mark as Junk.

Considered Not Junk

  1. Go to the Junk Email folder.
  2. Highlight an email that is considered not junk.
  3. Right click the email.
  4. On the pop-up menu click on Mark as not junk.
  5. Click on Add Sender to Block Senders List.


Block/Allow Senders List

  1. Click on Settings > Your App Settings > Mail
  2. On the Left click on Mail > Accounts > Block or Allow
  3. In Block List or Senders list, (if Junk Mail Filter is blocking legitimate email) add the senders email address.
  4. Click Save

Outlook Desktop Client

Please visit Overview of Junk Email Filter for more information.

Considered Junk

  1. Right click on the spam e-mail
  2. Click on Junk E-Mail in the pop-up menu
  3. Choose Mark as Junk and if you want to add sender’s email address to the Block list click on Block Sender.

Considered Not Junk


  1. Go to the Junk Mail folder
  2. Right click on the spam e-mail
  3. Click on Junk E-Mail in the pop-up menu
  4. Choose Mark as Not Junk and if you want to add sender’s email address to the Allow list please follow the instructions under Outlook Web App (OWA).

Block/Allow Senders List

This is only accessible via the Outlook Web Application (OWA).


Don't See Your Question Here?
Check out UNC's Office 365 Migration site. There are a lot of resources to help you become familiar with Office 365.

Check out Microsoft's FAQs for Office 365 ( Microsoft also has some great training videos you can watch to become familiar with using Office 365 applications. Please visit the Office Training Center.