Open up Mozilla Thunderbird and double click on the hoax message to open it as normal.
Click on the the
Viewbutton on the Toolbar, then select
[Message Source]as below:
This will display the full headers. Highlight them as shown in the screenshot below in order to copy the text.
You can now paste this information into a new email and send it to email@example.com
Full Headers on Mozilla Thunderbird
Written by IT Services. Latest revision 12 March 2015