Click on the the View button on the Toolbar, then select [Message Source] as below:
Figure tbird2.JPG [Opening up the message source]
This will display the full headers. Highlight them as shown in the screenshot below in order to copy the text.
Figure tbird3.JPG [Full headers button shown activated]
You can now paste this information into a new email and send it to phishing@it.ox.ac.uk