Broken image links in email archive

I've got an odd problem with broken image src URLs in the main article content of this email archive:

Looking in the source, the images aren't displaying because the image src URLs are appended with:


The images in all my other email archives (viewed via the script in Client Settings > Create newsletter archive) display fine. The image src URLs end in the file extension and no extra code is added.

Any ideas much appreciated.

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