title: How to I replace the default logo in transactional emails?
body: <p>I don't want to create templates for all transactional emails but I would like to replace the default Magento logo used for emails.</p>
  
  <p>I know that I can go into the base directory and replace it, but if I upgrade the system it will wipe it out. Does anyone know the proper way to change it?</p>