Email php not showing in certain formats! help!

I am trying to set up a newsletter system. I have taken the coding from codecanyon.net and have amended the newsletter templates etc.

You get the option to then send a preview, php resul开发者_开发百科ts show up in all the formats I have checked (i.e. hotmail) however some do not show the CSS styling.

However, when it runs as a cron job, the php raw coding shows and nothing else. Any help would be appreciated

Whether your email gets rendered correctly using the styling you put in the HTML depends entirely on the email client. So even if you have a perfectly styled html, the clients might just refuse to show the html and instead render it in plain text.