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Images show as white icons on white background

Symptom

The email signature preview OK until you activated campaign tracking. 

Then some images preview as white icons on a white background - They look as if they disappeared:

Cause

Vector graphics rendering (VML) doesn't support transparent background and we don't have any workaround.

It is all on Microsoft's end. In the above example the images are still present, not missing. But they are white icons on white background.

Resolution

Avoid using transparent images when campaign tracking is activated.

Instead create images/icons with white background. 

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