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I’ve been using this for years and can’t understand why it isn’t available in Mail’s GUI. Here’s what to do: Quit Mail.app Open Terminal.app Enter defaults write com.apple.mail PreferPlainText -bool TRUE and press enter (toggle it back by changing TRUE to FALSE) Open Mail.app View an HTML message and marvel at the readable plain text The catch is that this only works for messages that actually contain a plain text alternative, which far from all HTML email does.

Specify the minimum font size Apple Mail uses for HTML messages As a fallback for the messages that do not contain a plain text alternative it is useful to make sure that the text at least has a readable size: Quit Mail.app Open Terminal.app Enter defaults write com.apple.mail MinimumHTMLFontSize 13 in the Terminal window and press enter Open Mail.app View an HTML message and marvel at the readable font size You can change the font size to whatever suits your eyes. Apply both of these and you should be able to read most of the HTML email that you receive.