How to Fix “Outlook Spam Filter Not Working” Issue?

Jenny Lowrence | March 12th, 2026 | Outlook Errors

Have you ever faced a situation where your Outlook spam filter not working? If yes, then this blog is for you. In this blog post, we are going to discuss several troubleshooting solutions to solve this issue.

Microsoft Outlook is the most globally used email client by professionals and individual users. Its features make it totally different from other email clients. Using all of its features at work is a great way to improve performance.

Outlook has its own built-in spam filtering feature that automatically moves suspicious emails to the Junk folder. However, sometimes users notice that the spam filter stops working and unwanted emails appear in the inbox.

Let’s have a look at the main reasons that inform why Outlook does not filter spam.

Why is My Outlook Spam Filter Not Working?

  • If the junk filter is disabled or set to low protection.
  • Using an outdated version of Outlook
  • Conflicting of Outlook Add-ins
  • The safe or blocked sender list not working
  • Corruption of Outlook profile
  • The Outlook data file got corrupted

How to Fix Outlook Spam Filter Not Working?

Follow the instructions carefully to solve

1. Check Junk Email filter Settings

There is a built-in email protection level in Outlook to filter out suspicious emails. If it is disabled or set to a low level, then Outlook may allow spam emails.

Follow the below given steps to adjust span filter settings:

  1. Open MS Outlook on your system and go to Home tab.
  2. Click Junk >> Junk Email options.
  3. Set the protection level to High.
  4. Apply and press OK to save changes.

2. Disable Old Rules and Create New Rules

Sometimes old rules may move junk emails back into the inbox.

  1. Open Outlook and go to File >> Manage Rules & Alerts.
  2. Delete old or conflicting old rules.
  3. After that, restart Outlook and create new filter rules.

3. Temporarily Disable Add-ins

Some Outlook add-ins can interfere with the filtering rules. So identify and disable them.

  1. Open Outlook and click File >> Options.
  2. Click Add-ins and hit on Go.
  3. Disable all the Add-ins.
  4. Now, enable add-in one by one to identify the faulty one.
  5. After that, restart Outlook and check issue is solved or not.

4. Update Outlook

Ensure you are using the updated version of Outlook.

  1. Go to File >> Office Account in Outlook.
  2. Select update Options.
  3. Click Update Now.

5. Rebuild Safe & Blocked Sender Lists

Sometimes, the spam sender is added to the safe Sender list by mistake, then the spam emails go to the inbox.

  1. Open MS Outlook on your system.
  2. Click on Home tab and go to Junk.
  3. Choose the Junk E-mail Options and open the Safe Senders list.
  4. Check the list. If you find any unknown address, then select it and press Remove button.
  5. After that, go to Blocked Senders list and Add the unknown email address.
  6. Click on the Apply button and press OK.

6. Mark Emails as Junk Manually

  1. Open the inbox in Outlook and choose the unwanted email.
  2. Right-click on the unwanted email and select Junk.
  3. Choose Block Sender.
  4. The selected email will move to the Junk email folder.

7. Create a New Outlook Profile

A corrupted Outlook profile may prevent filter out spam filter from working. Generating a new Outlook profile can solve it.

  1. Close Outlook and open Control Panel.
  2. Click on Mail >> Show Profiles.
  3. Click Add to create a new Outlook profile.
  4. Enter the name of profile and press OK.
  5. Follow the on-screen instructions and click OK.
  6. After that, restart Outlook and set up new profile as the default.

8. Repair Outlook Data File

A corrupted Outlook data file can also lead to the Outlook spam filter not working issue.

  1. Open the Inbox Repair tool (ScanPST.exe).
  2. Choose your Outlook data file.
  3. Click on Start to begin scaning process.
  4. If it detects any issue then it clicks on Repair.

After repairing the file, open Outlook and check the spam filter works or not. Sometimes, the Inbox Repair tool fails to repair the Outlook data file. In that case, you can use Advik PST Repair Tool. The software will recover data from a corrupted PST file without any data loss. It can export the recovered data into multiple formats. This is a highly secure tool that preserves data integrity and maintains folder hierarchy.

Conclusion

Using Microsoft Outlook with its dynamic features for daily conversation is a great way to improve work performance. In this blog, we have explained why the Outlook spam filter not working. As we have explained, several techniques to fix the Outlook not filtering spam issue. By following these methods, you can easily resolve it.