The email was sent from a private PC that did not belong to Herr Wannabe.
Herr Doktor, of course, is the notorious Josef Mengele of Auschwitz, on the run from justice.
Up until now, history has not been kind to Herr Doktor Sadger.
German equivalent of Mr., 1650s, originally "nobler, superior," from Middle High German herre, from Old High German herro, comparative of her "noble, worthy, exalted," from PIE *kei-, a color adjective, in suffixed form *koi-ro- here meaning "gray, hoary," hence "gray-haired, venerable." Cognate with Old Frisian hera, Dutch heer; perhaps in this usage a loan-translation of Latin senior. Hence also Herrenvolk "master race," in Nazi ideology, the concept of the German people.