In the Details pane, right-click AllowImageProxyAuth, and then select Modify. Type AllowImageProxyAuth, and then press Enter. On the Edit menu, point to New, and then select DWORD (32-bit) Value. Locate and then select the following registry subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common Select Start, select Run, type regedit in the Open box, and then select OK. To resolve this issue, follow these steps: In this scenario, you are not prompted for authentication, and the image is not displayed. The HTML-formatted email message contains an HTTP reference to an image that requires proxy authentication.You use Outlook 2013 to open an HTML-formatted email message.You access the Internet by using a proxy server that is configured to use basic authentication.You have a computer that is running Microsoft Outlook 2013.An image in an HTML-formatted email message is not displayed in Outlook 2013 when you use a proxy server that is configured to use basic authentication
