In Microsoft Outlook, certain attachments might be blocked, preventing you from saving, deleting, opening, printing, or performing other tasks with the attachment within Outlook. This article from MiniTool provides guidance on resolving the issue of the Outlook blocked attachment error.

Upon receiving an email containing an attachment in Microsoft Outlook, you may encounter an alert message at the top of the screen:

Outlook blocked access to the following potentially unsafe attachments.

This error prevents you from working with the attachment in Outlook. In response, this guide will demonstrate several methods to address the problem.

How to Resolve the Outlook Blocked Attachment Issue?

Below are some approaches to dealing with Outlook's attachment-blocking feature.

Method 1: Access the Attachment via a File Share

To resolve the Outlook blocked attachment issue, request the sender to store the attachment on a server or FTP site where you can access it. The sender should then provide you with a link to the attachment on the server or FTP site. By clicking the link, you can download and save the attachment onto your computer.

Method 2: Change the File Name Extension

To prevent Outlook from flagging the attachment as potentially unsafe, ask the sender to rename the file to have a different extension. Once you receive the renamed attachment, you can save it locally and revert it to its original extension.

Here’s how to proceed:

1. Find the attachment in the email.
2. Right-click it and select Copy.
3. Paste it onto your computer, such as your desktop.
4. Right-click the saved file and choose Rename.
5. Modify it to the original file extension.

Method 3: Adjust Attachment Security Settings

Customizing attachment security settings can help bypass the blocking issue. Note that this involves modifying the Windows registry; thus, it’s advisable to create a backup beforehand.

Follow these steps:

1. Close Outlook.
2. Press the Windows key and R simultaneously to open the Run dialog.
3. Input regedit into the field and press OK.
4. Navigate to the location: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security (this applies to Outlook 2016, 2019, and Office 365).
5. Under the Edit menu, select New followed by String Value.
6. Label the new entry as Level1Remove and confirm.
7. Double-click the new string value and enter the desired file extensions (e.g., .exe;.com for multiple types).
8. Click OK and exit the Registry Editor.

Restart your computer and relaunch Outlook to verify if the issue has been resolved.

In conclusion, this article outlines three effective methods to tackle the Outlook blocked attachment error. Should you encounter similar problems, try these solutions. For alternative fixes or suggestions, feel free to comment below.

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