The https to http trick did work for us, ironically the Constant Contact icon doesn't appear in any of the test emails (cannot download the image). Also, the pattern for the background in the emails from Constant Contact doesn't appear, only the color of the pattern. It's something we can work around for now.
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Still not loading images for us when I did a test, using Outlook 2013. I also received an email from another CC user, their images did not download either.
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