HMTL rich text editor
HTML rich text editor can be switched by clicking “HTML composition” at the top-right corner as show above. In this editor, rich text and HTML are supported. You can write the mail content in BOLD, ITALIC, ITEMIZE, change font size and font color, or even insert image. Redo and Undo are also support as shown below.
Plain Text Editor
The plain text editor do not have any formatting functions.