cert-dns.itpays.net has no MX records.
Question and response
Question
dig cert-dns.itpays.net. MX
Answer
The response has no answer records.
Authority
itpays.net. 3600 SOA dns1.itpays.net. hostmaster.itpays.net. 2020090101 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0