using styles in emails is not the same as using styles in a web page.
before you send the message, switch HTML Editor to source mode, send the source code for the message and I will be able to tell you what is wrong.
There are a few things to keep in mind:
-If you are using CSS Styling, the CSS Must be applied inline:
<span style="color:#00FF00;"
- Not all style attributes are supported by all email clients:
css/