ns13.dnsmadeeasy.com has no MX records.
Question and response
Question
dig ns13.dnsmadeeasy.com. MX
Answer
The response has no answer records.
Authority
dnsmadeeasy.com. 180 SOA ns0.dnsmadeeasy.com. dns.dnsmadeeasy.com. 2009011933 14400 1800 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0