Send & Receive Issues

How to Troubleshoot Junk Email and Phishing Filters in Outlook

Kushani Nimanthika Sep 29, 2026 869 views

Question details

Users need to resolve issues where Outlook's junk email and phishing filters do not appear to stop unwanted messages, and understand the behavior of blocked senders.

How to Troubleshoot Junk Email and Phishing Filters in Outlook

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Managing unwanted emails, spam, and phishing attempts that continue to appear in the inbox or junk folder.
Observed behavior: Blocking a sender moves messages to the Junk Email folder instead of preventing delivery, and the folder icon causes confusion about whether filtering is broken.

Before you start

Ensure your Outlook application is connected to the server and verify whether your email account is managed by an organization, as IT policies may override personal junk mail settings.

Solution 1Recommended

Review Blocked Senders and Report Phishing Messages

Ensure you are correctly reporting malicious senders so the system can adapt and filter future emails effectively.

Blocking a sender does not stop their messages from reaching your account completely; it normally moves future messages from that sender directly to the Junk Email folder.

To train Outlook's filters against malicious threats, it is better to report phishing rather than just blocking the sender.

Select the malicious message

Open Outlook and locate the unwanted or malicious email in your inbox.

Report as phishing

Click on the 'Report phishing' button in the ribbon, or right-click the message and select the appropriate reporting option to notify Microsoft's global filtering system.

Review Junk Email options

Navigate to 'Junk' > 'Junk E-mail Options' in the Home ribbon to verify your Blocked Senders and Safe Senders lists are correctly configured.

Review Blocked Senders and Report Phishing Messages

Junk Folder Icon: The icon for the Junk Email folder is typically a circle with a diagonal line through it. This is standard and does not indicate that your filtering is broken.

Solution 2

Check Inbox Rules and Mail Flow Settings

Conflicting inbox rules or organization policies might be bypassing your junk email filters and allowing spam to enter your inbox.

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Frequently Asked Questions

Why do blocked emails still show up in my Junk Email folder?

Blocking a sender in Outlook does not prevent the email from being delivered to your account entirely. Instead, it automatically routes any future emails from that sender directly to your Junk Email folder to keep your primary inbox clean.

What does the circle with a diagonal line icon mean on the Junk folder?

This icon is standard in Outlook and simply represents the Junk Email folder. It does not mean that your spam filter is disabled, broken, or malfunctioning.

How do I permanently stop a sender from emailing me?

While Outlook's default Block Sender feature moves emails to the Junk folder, you can create a specific Inbox Rule to permanently delete emails from particular senders as soon as they arrive.

Why are obvious phishing emails bypassing my junk filter?

Your organization's mail flow settings or global security policies might be overriding your local junk email settings, or the sender might be spoofing a trusted domain. Always use the 'Report phishing' button to help train the filter.

Outlook & Email Problems