kb.internap.com has no MX records.
Question and response
Question
dig www.inap.com. MX
Answer
The response has no answer records.
Authority
inap.com. 1800 SOA chin.ns.cloudflare.com. dns.cloudflare.com. 2397088894 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0