Blocked access to an attachment

Overview

This article describes how to change the type of file extension to allow access to an email attachment that was previously blocked.

Environment

Microsoft File Explorer, email

Troubleshooting/Resolution

To receive a blocked message from a sender, have the sender rename the file to an extension that is allowed (recommend renaming to .jmu) and resend.
Once the file arrives, save it and rename it to the original extension.
 
Note: To see the file extension in:

Windows 10:

  • Click the Windows icon
  • Type  the words "file extension" and click on the option Show or Hide File Extensions to turn it on
  • Click OK

Windows 11:

  • Click the Windows icon
  • Type  the words "file extension" and click on Show Files Extensions in File Explorer
  • Under File Explorer select "on" next to Show File Extensions
  • Click OK

MacOS 10.14 and later

  • Click on the desktop to activate Finder 
  • Click Finder at the top and Select Settings 
  • Click the Advanced icon (looks like two gears)
  • Check the Show all file extensions box. All file extensions will now be visible both on the desktop and in open windows.
Additional Information or Notes

For additional questions you can contact the JMU IT Help Desk at helpdesk@jmu.edu or 540-568-3555.

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