mailsql0.chi1.ntfo.org has no CNAME records.
Question and response
Question
dig mailsql0.chi1.ntfo.org. NS
Answer
The response has no answer records.
Authority
chi1.ntfo.org. 1730 SOA ntfo.org. postmaster.ntfo.org. 2026020901 3600 14400 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0