https://krebsonsecurity.com/2018/12/how-internet-savvy-are-your-leaders/In Short: Scammers send papers labeled "not invoice" which look exactly like an invoice to make idiots pay their non-service. Publicly available documents show there are lots of idiots out there, as Customers range from the "2008 Hillary Clinton for President" fund (YES- this single scheme goes for > 10 Years!) and other politicians of *all* parties to various cities, schools and the like. Discover the "Neuland", suckers.