Log in to NetCommunity using your organization's domain (e.g. "donate.yourorganization.org") rather than the Blackbaud domain (e.g. "12345.bbnc.bbcust.com") and send the test message again.  Observe that the image displays and/or downloads [depending on your specific email client] properly.

When you prepare to send the final version of the message, ensure that you are doing so while logged in to the NetCommunity site using your organization's domain.

If for some reason your organization does not have a Fully Qualified Domain with an SSL certificate and still is sending emails through NetCommunity, the images can be inserted as external links. Note: We do not recommend sending emails using the bbcust URL.