mail.kepler.getspace.us has no CNAME records.
Question and response
Question
dig mail.kepler.getspace.us. NS
Answer
The response has no answer records.
Authority
getspace.us. 2157 SOA ns1.getspace.us. vytautas\.p.getspace.lt. 2026012100 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0