smtp.anchoroffice.com has no CNAME records.
Question and response
Question
dig smtp.anchoroffice.com. NS
Answer
The response has no answer records.
Authority
anchoroffice.com. 10800 SOA ns1.logixcom.net. hostmaster.logixcom.net. 2022122003 7200 3600 604800 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0