I go to the site where the mail originates and find administrator adresses or addresses for complaints. It's not hard.
(1) Set up email address.
(2) Register at DU using that address.
(3) Make post at DU rational enough to generate response.
(4) DUmmies send hate-filled, threatening email.
(5) Forward email to administrator.
(6) DUmmie gets email account deleted.
That is a laugh riot!