_spf.eslasticemail.com has no CNAME records.
Question and response
Question
dig _spf.eslasticemail.com. NS
Answer
The response has no answer records.
Authority
eslasticemail.com. 1844 SOA dns.eslasticemail.com. hostmaster.eslasticemail.com. 1779336636 43200 3600 604800 3601
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0