How to remove highlighting from emails in Mail? I created a rule that applies a mint green color to a lot of emails in my mailbox. I no longer want that color on those emails and I do not see a way to remove this highlighting for even a single email. I know I could create a new rule to give them a different color, but there is no rule semantics for removing color either.

It seems that all of my email's subjects in Mac Mailbox are now permanently stained.
Looks like you can do it by adding a new Rule [I haven't tested it, because I don't want to actually reset my own colours…]

Try setting Any condition > Every Message > Set Colour…



Note: the 'Other colour seems to depend on your current Colour choice in the Colours floater - Format > Show Colours…



You can do it manually, select one message, pick a colour - but it seems very hit &amp; miss, sometimes works, sometimes doesn't.