Teachers at a Brooklyn high school were victims of another troubling antisemitic act Tuesday when they received a disturbing email calling for the extermination of Jewish people. The threatening message was sent from an address called “killalljewsnow” to history teacher Danielle Kaminsky and another colleague at Origins HS in Sheepshead Bay — which, as exposed by The Post, has been plagued by shocking displays of antisemitism carried out by students. “All Jews need to be exterminated. Their doors kicked in in the middle of the night. A bullet put in each of their heads,” read part of the email, which...