Why can't I get paragraphs

If I am using the default email template to send a single email, I can’t get paragraphs in the message to separate with a blank line.
It looks like this message. The last line in the paragraph is shorter than the others, but no blank like appears to separate paragraphs.
Of course a short one line paragraph is just short.
Is there a solution?

Hey, @Mike_Wright, When I hit the enter key after a paragraph, it gives me a line break. How are you entering the text?