smtp-pro.mana.pf has no CNAME records.
Question and response
Question
dig smtp-pro.mana.pf. NS
Answer
The response has no answer records.
Authority
mana.pf. 3600 SOA ns01.mana.pf. system.mana.pf. 2025121500 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0