vip1.g5.cachefly.net has no MX records.
Question and response
Question
dig vip1.g5.cachefly.net. MX
Answer
The response has no answer records.
Authority
cachefly.net. 2560 SOA ns1.adns.cachefly.net. hostmaster.cachefly.net. 1771815602 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0