In that case Anne, I'll need to log this as a fault. Please update your community profile to include your full name, landline and mobile number, so that I can pass your details over to the Networks team.
To add your details you click on MY SETTINGS above the thread in blue then choose PERSONAL INFORMATION after adding your details add the email address/es in the private section and click save changes at the bottom of the page.
It would really help if you could add the mail addresses that you get these header only messages from in the private notes section.