smtpout3-a2.phpnet.org has no CNAME records.
Question and response
Question
dig smtpout3-a2.phpnet.org. NS
Answer
The response has no answer records.
Authority
phpnet.org. 1552 SOA ns.phpnet.org. grenoble.phpnet.org. 2026022633 3600 1800 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0