_spf-pack.mysmtp.com has no CNAME records.
Question and response
Question
dig _spf-pack.mysmtp.com. NS
Answer
The response has no answer records.
Authority
mysmtp.com. 371 SOA pdns01.domaincontrol.com. dns.jomax.net. 2026011907 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0