I understand that styling emails is non-trivial, but it can't be impossible. You presumeably have a team of developers that should be able to come up with something. As a work-around, could you at least just let us upload an image of a sufficient width (bigger than 800px) and just not tile it ie: the equivqent of background-repeat: no-repeat? Option 2: Wrap the entire email in a table and put the background image on the table .. or the cell .. or as an absolutely placed image in the table cell. Wouldn't something like that work?
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