mail2.phg.systems has no CNAME records.
Question and response
Question
dig mail2.phg.systems. NS
Answer
The response has no answer records.
Authority
phg.systems. 297 SOA dns1.gestiondeservidor.com. hostmaster.gestiondeservidor.com. 2024051066 86400 86400 86400 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0