Your Outlook junk email list may not sync between your computer and phone. This happens because the safe and blocked sender lists are stored locally on each device. The automatic sync feature does not apply to these specific lists. This article explains how to manually export your list from one Outlook and import it to another device.
Key Takeaways: Manually Sync Your Junk Email Filters
- File > Options > Mail > Junk Email > Export to File: Creates a text file containing all your safe and blocked senders from your primary computer.
- File > Options > Mail > Junk Email > Import from File: Loads the exported list into Outlook on another device to replicate your junk filter rules.
- Junk Email > Junk Email Options > Safe Senders/Blocked Senders tabs: Lets you review and edit your lists before or after the import and export process.
Why Junk Email Lists Do Not Sync Automatically
Outlook manages junk email filtering through rules stored in a local data file on your device. For accounts using Microsoft Exchange, many settings sync via the server. However, your personal safe senders and blocked senders lists are exceptions. They are designed as a personal preference tied to the specific Outlook profile on one machine.
This design prevents a list you create on your work computer from accidentally affecting mail filtering on a shared family device. The trade-off is you must manage the list on each device separately. The export and import function provides a manual bridge to copy these preferences from one Outlook installation to another.
Prerequisites for Exporting and Importing
You need access to the Outlook desktop application on both the source and target devices. The Outlook on the web interface and mobile apps do not support this specific import and export function. Ensure you are using a recent version of Outlook as part of Microsoft 365 or Outlook 2016 and later. The process uses a plain text file with a .txt extension, which you must transfer between devices, such as via email attachment or cloud storage.
Steps to Export Your Junk Email List
Follow these steps on the computer where your current junk email list is set up.
- Open the Junk Email Options dialog
In Outlook, go to the Home tab. Click Junk in the Delete group, then select Junk Email Options from the menu. - Navigate to the export function
In the Junk Email Options window, click the Export to File button. This button is located at the bottom of the window, below the list tabs. - Choose the export file location
A file save dialog will open. Choose a location you can easily access, like your Desktop or Documents folder. The file will be named blockedsenders.txt by default. Click Save. - Confirm the export
A confirmation message will appear stating your safe and blocked senders have been exported. Click OK, then close the Junk Email Options window.
Steps to Import the List on Another Device
First, move the exported .txt file to the new device. You can email it to yourself or save it to a service like OneDrive. Then, open Outlook on the target device.
- Open Junk Email Options on the new device
In Outlook, go to the Home tab. Click Junk and then select Junk Email Options. - Initiate the import
In the Junk Email Options window, click the Import from File button located at the bottom. - Select the exported file
Navigate to the location where you saved the blockedsenders.txt file. Select it and click Open. - Verify the import
Open the Safe Senders and Blocked Senders tabs within the Junk Email Options window. You should see all the addresses from your original list. Click OK to close the window.
If the Import or Export Buttons Are Missing
Outlook Interface Shows No Export Button
The export and import buttons are only available in the desktop application for Microsoft 365, Outlook 2021, 2019, and 2016. If you use Outlook on the web or a mobile app, you will not see these options. You must perform the operation on a Windows or Mac computer with the full Outlook program installed.
Imported List Does Not Appear
If you import the file but your lists remain empty, the file may be corrupted. Open the blockedsenders.txt file in Notepad to check its contents. It should contain sections labeled [Safe Senders] and [Blocked Senders] followed by email addresses or domains. If the file is empty or malformed, return to the source computer and export the list again.
Outlook Asks to Overwrite Existing Entries
When you import a list, Outlook adds the new entries to any existing ones. It does not delete your current safe or blocked senders. If you want a clean copy, you can manually clear the lists before importing. Go to each tab in Junk Email Options, select all entries with Ctrl+A, and click Remove.
Managing Junk Filters: Local vs. Server Storage
| Item | Local Junk Email Lists (Safe/Blocked Senders) | Server-Side Junk Filtering |
|---|---|---|
| Storage Location | Stored in a file on your computer’s hard drive | Stored on your email provider’s server |
| Sync Across Devices | No automatic sync, requires manual export/import | Usually syncs automatically across all devices |
| Control Level | Full user control over specific addresses and domains | Based on provider algorithms and community reports |
| Access Point | Managed only in the Outlook desktop app Junk Email Options | Can be influenced via Junk reporting in Outlook and webmail |
| File Format | Exported as a plain text (.txt) file | No user-accessible file, managed by the service |
You can now copy your junk email filter rules to any computer running Outlook. Use the export function to create a backup before reinstalling Windows or setting up a new work PC. For ongoing management, review your lists every few months to remove old entries. An advanced tip is to use domain-level blocking in the Blocked Senders list, such as @example.com, to filter all mail from a specific organization.