mail.lactld.org has no CNAME records.
Question and response
Question
dig mail.lactld.org. NS
Answer
The response has no answer records.
Authority
lactld.org. 68986 SOA a.lactld.org. hostmaster.lactld.org. 2026022600 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0