host ten-1.test.ex [V4NET.0.0.1] MX=1 port=99
host ten-2.test.ex [V4NET.0.0.2] MX=1 port=99
host ten-3.test.ex [V4NET.0.0.3] MX=3 port=66
host ten-1.test.ex [V4NET.0.0.1] MX=1 port=99
host ten-2.test.ex [V4NET.0.0.2] MX=1 port=99
host ten-3.test.ex [V4NET.0.0.3] MX=3 port=66