yesdefinitely.win has no MX records.
Question and response
Question
dig yesdefinitely.win. MX
Answer
The response has no answer records.
Authority
win. 900 SOA ns1.dns.nic.win. admin.tldns.godaddy. 1772487733 1800 300 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0