Make Apple Mail display plain text

Some of us prefer our mail clients to display mails in plain text. Here’s how to set it.  Open ~/Library/Preferences/com.apple.mail.plist, click on the Root key, click “Add Item.”  Call it ‘PreferPlainText’ and set the type to boolean.  This gives you a checkbox to enable or disable it.

You can also do it via the terminal:

defaults write com.apple.mail PreferPlainText -bool TRUE

Or to disable:

defaults write com.apple.mail PreferPlainText -bool FALSE