mail1.yourjobnotification.com has no CNAME records.
Question and response
Question
dig mail1.yourjobnotification.com. NS
Answer
The response has no answer records.
Authority
yourjobnotification.com. 10800 SOA ns1.he.net. hostmaster.he.net. 2025092600 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0