tests for mx records
$TTL 300
-@ IN SOA DEFAULT_NOT_SET. DEFAULT_NOT_SET. 2017032173 3600 600 604800 1440
-xn--o-0gab IN CNAME xn--ndaaa.xn--ndaaa.
+@ IN SOA DEFAULT_NOT_SET. DEFAULT_NOT_SET. 2017032394 3600 600 604800 1440
+ IN MX 7 foo2.com.
+mail IN MX 15 foo3.com.
