It's an old-known vulnerability (2009) used to bypass spam-filters: http://www.mounirorfi.com/blog/2015/02/18/why-vietnam-resolves-to-localhost/ http://www.moun

It's an old-known vulnerability (2009) used to bypass spam-filters: http://www.mounirorfi.com/blog/2015/02/18/why-vietnam-resolves-to-localhost/ http://www.mounirorfi.com/blog/2015/02/18/why-vietnam-resolv...