sftptest.simplimation.com has no CNAME records.
Question and response
Question
dig sftptest.simplimation.com. NS
Answer
The response has no answer records.
Authority
simplimation.com. 3581 SOA ns1.simplifywebhost.com. simplimation.gmail.com. 2026021115 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0