Ever get frustrated that SharePoint Designer doesn't make it easy to add HTML like tables and/or images?
If you click on Advanced Properties on your mail action, and click on Body, you can open it up and edit the HTML directly there.
But there's a catch, if you ever open that back up and edit/save it in the normal UI screen, all of your changes go away!
BUT, if you remove the following tag from that Body property:
<META NAME="Generator" CONTENT="MS Exchange Server version 08.01.0240.003">
your message when viewed via the normal UI will all be HTML, and your changes will be forever saved.
