w2k303.infusionsoft.com has no MX records.
Question and response
Question
dig w2k303.infusionsoft.com. MX
Answer
The response has no answer records.
Authority
infusionsoft.com. 1800 SOA alan.ns.cloudflare.com. dns.cloudflare.com. 2397313989 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0