As a Chief of Staff of Seven’s Sunrise program said “We don’t have a lot of time to read lengthy emails so they need to be short and to the point. If I don’t understand the pitch/story in the first read I never will.”
Try to keep the length of your email to about three or four sentences and copy and paste the media release into the body of the email. Also add the media release as an attachment. Journalists like to be able to skim read quickly without having to click on anything.
If they go ahead with your story the attachment will make it easy to print the media release for future reference. Remember they are short on time. Make it easy for them.