I am looking for a Windows email client which has options to change font in reading pane.

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    I doubt that is the only requirement that you have for your email client - other features seem much more important. So please edit your question and describe what else is required. Reading this helps – user416 Aug 9 '17 at 8:22

Thunderbird, which is available for Windows, OS X and Linux, is free software and you can set the default font settings in the settings like here:

enter image description here You can also disallow messages to use other fonts, so your setting wins always: enter image description here

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