Coloured labels on the fly for Mail.app

Alex Valentine asks, “Please tell me, is there a way to add color labels to your messages, like one can in Eudora?”

Yes, there is. In fact there are at least three ways to do this in Apple Mail:

1. Use the Label Scripts collection of AppleScripts.
2. Set up rules in Mail Act-on that will colourise the background of emails in Mail.app on the fly with a keystroke conbination. This is what I do, also setting a MailTags keyword which tells my smart mailboxes what to display.
3. Use the tutorial and AppleScript provided in this hack on O’Reilly.com.

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