That happens on mine too. Same issue, I think how it has been explained to me is that when it sends the message it is sent in html and you are viewing it as text. Try backspacing all the way back between lines of text and then hit return where you want the spacing. Sometimes you may hit return and when you are viewing it, there is not any spacing. But when you view the email it will have the correct spacing. Let me know if this is a good explanation. This should help!