mx.pydcloud.com has no CNAME records.
Question and response
Question
dig mx.pydcloud.com. NS
Answer
The response has no answer records.
Authority
pydcloud.com. 428 SOA ns1.linode.com. info.paraguaydominios.net. 2021000017 14400 14400 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0