I'm in the process of creating some marketing email templates for use in case I'm not around. Unfortunately we have very image heavy HTML emails, though that is neither here nor there. The problem I'm having is that we have one bottom border in particular that displays differently in Outlook when the editor code is enabled in Dynamics. Example below.
With "<meta type="xrm/designer/setting" name="type" value="marketing-designer-content-editor-document">" in <head>:

Without "<meta type="xrm/designer/setting" name="type" value="marketing-designer-content-editor-document">" in <head>:

I was trying to narrow down the problem, so this is literally with no other HTML touched. Gmail, of course, works just fine.
This must be a bug, right? Really, I just hope I'm missing something super obvious.
Thanks, all!