mailer.faitid.org has no CNAME records.
Question and response
Question
dig mailer.faitid.org. NS
Answer
The response has no answer records.
Authority
faitid.org. 600 SOA ns3-geo.nic.ru. dns-team.flexireg.net. 65014269 1440 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0