This plugin updates the Zen Cart HTML email subsystem, moving all CSS styling to a separate, common file and adding constants with which you identify the file-name, alt/title text and image dimensions for the emails' logo image. Starting with v1.1.0, there is also the provision to add an additional HTML block to each email's header area. No more editing thirteen separate email templates to change the background color or update the logo-image!
The plugin also updates each of the HTML email templates to include an HTML viewport meta-tag, enabling those emails to be view properly on smaller screen sizes.
Note: Starting with Zen Cart v1.5.5, the functionality provided by this plugin is included in the Zen Cart core, thus rendering this plugin obsolete for that and later Zen Cart versions.