mfox.top has no MX records.
Question and response
Question
dig mfox.top. MX
Answer
The response has no answer records.
Authority
mfox.top. 1800 SOA audrey.ns.cloudflare.com. dns.cloudflare.com. 2394102715 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0