How to remove GrowlMail (on Mavericks)?

I've installed Mavericks and started to us the Mail app from Apple again, but every time I start Mail I get the message:

Incompatible Plug-ins Disabled

Mail has disabled the following plug-ins:

Growlmail

I've tried disabling and removing it in the System Preferences under Growl but the message above keeps popping up when I start Mail.

How can I remove it?

Close Mail.app

Open a Terminal and enter chflags nohidden ~/Library.

Now you can navigate with your Finder to the following directories and delete the plugin GrowlMail.mailbundle:

When starting Mail.app now, you shouldn't get any error messages related to GrowlMail.

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