FYI: If you set IE (any IE window) into offline mode and leave it that way, PopTrayU’s embedded IE window will be set offline as well. Which means it won’t load spam images or for that matter any external content. But it also means you’ll have to use another browser to actually surf the internet or download files at the same time as you’re previewing your emails. But if you’re really concerned about spam image tracking, and can’t live without HTML preview, you may wish to try this.
[Ed note: This trick is no longer needed with current versions of the software]