[X4U] Colorizing email with Mail.app rules.

[Robert Nicholson]

When Mail.app colorizes email it does so by editing the actual  
message and appending a plist to the end of it. This is unfortunate  
because if you later decide you don't want the rule to take affect it  
won't undo this persistent color will it?

Specifically if you decide later that you didn't want the mail  
colored and you don't want a Color element in the plist at all. ie.  
you don't just want to reset to black as that itself is a color  
element added to the plist but you want Mail.app's default behaviour  
which is no additional coloring.

So how can you reset the state of the messages to reflect no  
additional coloring?