I've been struggling with an issue this past week with some settings that we've made to our institution's email transport rules in order to add an image to the bottom of every employee email. HTML emails look fine, but when messages are sent as rich text, they're surrounded by a 1px grey border and are placed inside a container with a yellow background.

Here's a list of the things I've already tried:

  • Eliminated any color profile from the image
  • Zeroed every setting imagineable
  • Stripped out any containing elements

What can be done here to remove this grey 1px border around the image and the yellow container?