mail-london-01.patchman.co has no CNAME records.
Question and response
Question
dig mail-london-01.patchman.co. NS
Answer
The response has no answer records.
Authority
patchman.co. 1800 SOA emma.ns.cloudflare.com. dns.cloudflare.com. 2397562289 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0