| Block Type | User Experience | Typical Cause | |------------|----------------|----------------| | | Attachment cannot be saved, opened, or even seen; user receives "Outlook blocked access to the following potentially unsafe attachments" | File extension in Level 1 list (e.g., .exe, .vbs, .js) | | Level 2 (Soft Block) | User can save to disk after a warning, but cannot open directly | File extension in Level 2 list (e.g., .reg, .cpl) | | Web / Tenant Block | "This attachment is blocked due to organization policy" | Microsoft 365 Safe Attachments or Exchange mail flow rules |
Users who cannot change settings and cannot contact IT support. outlook unblock attachment
Users who frequently receive legitimate blocked files (like .exe or .url ) and want to disable the filter for specific file types. | Block Type | User Experience | Typical
Use Exchange PowerShell:
Outlook blocks these attachments for a reason. Files like .exe (executables) are the most common way for ransomware and viruses to spread. Files like
: Right-click in the right pane, select New > String Value , and name it Level1Remove .