Hi Steven – in case you can access the company logo via an external URL *somewhere*,
use the Modeler and replace the Rich Text widget on the EmailTemplate Edit-page (HTML tab) by a normal text area and code the HTML body part in HTML directly. It’s cumbersome though. And use the <img src=URL> tag to include the external logo URL.
You can create your emal template complete in HTML. You could use the Rich text widget to make it easier for the one who creates the templates. You can then even drag and drop the images in the text.