Why are my Email Images being dynamically filtered from my email in Outlook?

July 27, 2016

When viewing an email in Outlook, the HTML can be dynamically modified by an email filtering service. A common email filtering service is provided by McAfee. The email filtering service can dynamically replace the HTML source code for the email's images and replace them with a transparent image/gif. When this occurs, there will be a whitespace in place of the image within your email in Outlook.

You can verify this by following the steps below to view the email's source code:

  • Navigate to your email in Outlook and double-click on the message to open it in a new window or select View > Open in New Window.
  • Click on Actions > Other Actions View Source.
Copy out the Source Code from the pop-up window and Paste this into your Text Editor, like Notepad
  • In the Source Code, locate an Images source tag by searching for "src"

If you see the above source for your Images, this is a result of McAfee's email filtering service dynamically replacing the content with a transparent image. If you see this within your emails you will need to work with
your IT Team to adjust the content filter settings within your email filtering service.