mail.eishome.com has no CNAME records.
Question and response
Question
dig mail.eishome.com. NS
Answer
The response has no answer records.
Authority
eishome.com. 3600 SOA ns1.litewire.net. admin.eishome.com. 2018102332 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0