Email+ now supports for captioning for images. Both "large" and "custom" images can include a caption. Captions may be aligned left, right, or center.
As a reminder "large" images are automatically resized to 270px wide when uploaded. This proved to be the optimal size for all device types.
"Custom" images are sized by you (in pixels). If custom images are aligned left or right the content will wrap appropriately. If aligned center content does not wrap.