Start Macmail and double click on the suspected hoax message to open it as normal
Click on the
Viewbutton on the Toolbar, then hover the mouse over
[Message], then click on
[Long Headers]as below:
This will display the full headers. You can then highlight them and copy the text and paste it into a new email.
Full Headers on Macmail
Written by IT Services. Latest revision 5 September 2014