How to Fix Outlook Messages Being Marked as Spam

When legitimate emails bypass your inbox and land directly in the spam or junk folder, it disrupts critical communications and delays time-sensitive workflows. This issue occurs when email filters misinterpret the sender's domain reputation, email content, or attachment types as malicious. Whether you are missing important client updates or your own outbound messages are being blocked by recipients' email providers, resolving this requires adjusting specific filter settings and modifying how you handle email attachments.

The built-in filtering algorithms use aggressive heuristics to sort incoming mail. To correct these false positives, you must manually train the system, adjust the sensitivity threshold, and ensure your own sending habits do not trigger common security alerts. The following troubleshooting steps will guide you through reconfiguring these settings directly within the email client.

Mark Misclassified Messages as Not Junk

The most immediate way to fix routing errors for incoming mail is to manually identify false positives. This action moves the current message to your inbox and updates the local filtering algorithm to recognize the sender as legitimate.

1. Open the desktop application and click on the Junk Email folder in the left-hand navigation pane.
2. Locate and click on the message that was incorrectly flagged.
3. Right-click the selected message, hover your cursor over the Junk option in the context menu, and click Not Junk.
4. A dialog box will appear. Check the box labeled Always trust e-mail from [Sender's Address] to prevent future blocking.
5. Click OK. The system will instantly transfer the message to your primary Inbox.

Add Domains to the Safe Senders List

If you consistently miss emails from an entire organization, whitelisting their specific domain is more efficient than marking individual addresses. This overrides automatic filtering for any incoming message originating from that domain.

1. Navigate to the Home tab on the main ribbon.
2. In the Delete group, click the Junk dropdown menu and select Junk Email Options.
3. Click on the Safe Senders tab at the top of the new window.
4. Click the Add button.
5. In the text field, type the domain you want to whitelist (for example, type @company.com instead of a specific name).
6. Click OK to close the input box, then click Apply at the bottom of the window.
7. Verify the addition by checking that the domain now appears in the active Safe Senders list on your screen.

Lower the Built-in Filter Sensitivity

Sometimes the local client is set to an overly aggressive security posture, catching standard newsletters and formatted business emails. Lowering this sensitivity reduces the volume of false positives.

1. Click the Home tab, select Junk, and open Junk Email Options.
2. Navigate to the Options tab.
3. Review the current protection level. If it is set to High, change the selection to Low. This setting filters out the most obvious unsolicited bulk messages while leaving standard business communications alone.
4. If you prefer to manually control everything and solely rely on your blocked lists, select No Automatic Filtering.
5. Click Apply and then OK to save the new threshold.

Format Outbound Emails to Bypass Recipient Filters

If the messages you send are landing in your recipients' spam folders, the issue lies with your outgoing content or domain reputation. Aggressive formatting, broken HTML, and suspicious attachments automatically trigger recipient firewalls.

• Remove excessive formatting: Avoid using all-caps in your subject lines and limit the use of colored fonts or excessive exclamation points within the body text.
• Limit links: Do not paste raw, unformatted URLs into the body. Use clean hyperlinks attached to relevant text, and avoid linking to unsecured (HTTP) websites.
• Avoid complex attachments: Sending macro-enabled documents (like .docm or .xlsm) or executable files often results in an automatic block by server-side security policies.

Using WPS Office to Prepare Spam-Safe Attachments

WPS Office cannot change Microsoft Exchange server settings, backend email rules, or your domain's SPF/DKIM authentication records. Those configurations are entirely controlled by your email administrator or Microsoft account settings. However, if your outbound messages are being flagged due to heavy, editable, or macro-laden document attachments, you can use WPS Office to create secure, flattened PDF files that easily pass through recipient security filters.

Converting a standard word processing file or spreadsheet into a PDF removes hidden metadata and executable code that often triggers spam alerts. Here is how to prepare a secure attachment using WPS Office:

1. Open your finalized document in WPS Writer, WPS Spreadsheet, or WPS Presentation.
2. Click the Menu button located in the top-left corner of the interface.
3. Select Export to PDF from the dropdown list.
4. In the export dialog, ensure the Export Range covers the necessary pages and select the Standard optimization level to keep the file size manageable.
5. Click the Export to PDF button and save the file to your local drive.
6. Open your email client, create a new message, and attach this newly generated PDF instead of the original raw document.

Because PDFs are universally recognized as standard, read-only documents, mail servers process them with significantly lower security suspicion compared to editable files, ensuring your outbound messages reach the recipient's primary inbox.

Frequently Asked Questions

Why do messages from addresses on my Safe Senders list still go to the junk folder?

This typically happens when a custom Inbox Rule overrides your junk settings, or when a server-level firewall (managed by your IT department) intercepts the message before it reaches your desktop application. To verify this, navigate to File > Manage Rules & Alerts and review your custom rules to ensure none are programmed to route specific keywords to the junk folder. If no rules match, the block is occurring at the Exchange server level, which requires administrator intervention.

Can I apply these junk filter settings to the web version of the email client?

The desktop application's specific "High" or "Low" slider settings process mail locally and do not fully mirror the web interface. However, your Safe Senders and Blocked Senders lists do synchronize across your account. To manage lists on the web, click the Settings gear icon, navigate to Mail, and select Junk email. Any domains you add to the Safe senders and domains list here will apply universally across all your devices.

What should I do if my own sent messages generate a non-delivery report (NDR) citing a spam block?

If you receive a bounce-back message explicitly stating your email was rejected for spam reasons, your email address or IP address may be on a public blacklist. Review the exact error code in the NDR. If you are a standard user, forward this NDR to your IT support desk. If you manage your own domain, you must verify that your SPF, DKIM, and DMARC DNS records are correctly published through your domain registrar, as missing authentication is the primary cause of outbound blocks.

Will turning off automatic filtering expose my computer to malware?

Selecting "No Automatic Filtering" stops the local client from evaluating message content for spam criteria, meaning unsolicited marketing emails will clutter your inbox. However, it does not disable backend malware scanning. Your email provider's server-side antivirus and your computer's local endpoint protection will still scan incoming attachments and links for malicious code. You will simply have to rely entirely on manually adding addresses to your Blocked Senders list to stop nuisances.