mail.rcpod.space has no CNAME records.
Question and response
Question
dig mail.rcpod.space. NS
Answer
The response has no answer records.
Authority
rcpod.space. 3752 SOA ns1.reg.ru. hostmaster.ns1.reg.ru. 1771389292 14400 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0