tier1.quicns.com has no MX records.
Question and response
Question
dig tier1.quicns.com. MX
Answer
The response has no answer records.
Authority
tier1.quicns.com. 14400 SOA jon.quicns.com. dns.quicns.com. 1772409132 14400 2400 2419000 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0