Hello @TomM37 ,
Most likely. Each email program/app has their own little way of handling dark mode, and it can unfortunately be kind of a guessing game. The only way to really avoid this is to use as neutral and contrasted of coloring as possible (e.g. white letters with black background) between the text and backgrounds. Grays tend to be left alone, which can ironically lead to issues if the background gets converted to a dark color like black.
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