If part of your email is not being displayed there are two common causes:
You have copied and pasted parts of your message from Microsoft Word.
If you copy and paste from Word some of the formatting tags will be
carried over when you paste into Email System. These formatting tags are
not standard HTML and can cause parts of the message not to be
displayed. To get around this copy and paste your text into notepad
first. Then copy it from notepad and paste it into your email.
You did not close a comment tag in the HTML. If you do not close all of
your comment tags in the HTML some clients will not correct for this
and not display anything in the message after the unclosed comment tag.