MailPluginFix is a free tool which will help you to fix any incompatible Mail.app plugin (GrowlMail for example) after an update of Mac OS X.
Just start the application and you will see a list of all incompatible plugins for your current Mail.app installation. Just select the ones you would like to fix and press the start button in the toolbar.
All selected plugins will get patched with the UIDs of the current Mail.app version and also all disabled plugins will be enabled again.
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