kitt.a2hosting.com has no MX records.
Question and response
Question
dig kitt.a2hosting.com. MX
Answer
The response has no answer records.
Authority
a2hosting.com. 1800 SOA cass.ns.cloudflare.com. dns.cloudflare.com. 2396996445 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0