Too verbose, make it more concise :)
Oooops, I am sorry, I need to change my signature.
Tim, congratulation on your new position.
I trust you are the best Project Lead JBM would ever find! Take over and lead our mission, to make JBM the best messaging system on the planet (you should trademark this :) ).
I would also like to use this occasion to officially announce my departure from Red Hat. However, I will keep close ties with the project, and naturally, retain my commit rights.
Full steam ahead!