mailman.fmt1.pfcs.com has no CNAME records.
Question and response
Question
dig mailman.fmt1.pfcs.com. NS
Answer
The response has no answer records.
Authority
fmt1.pfcs.com. 10800 SOA dns-mgmt.fmt1.pfcs.com. root.pfcs.com. 2025021500 86400 14400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0