Allowing topic creation through direct delivery email in makes my forum vulnerable to spammers

Product Support
16

You should be able to run this from the console to easily delete them:

destroyer = UserDestroyer.new(Discourse.system_user)
UserEmail.where("email LIKE '%@qq.com'").each { |ue| destroyer.destroy(ue.user, delete_posts: true, context: "qq.com users are spamming us")}

(as always, take a backup first)