_SPF.elasticemail.com has no CNAME records.
Question and response
Question
dig _SPF.elasticemail.com. NS
Answer
The response has no answer records.
Authority
elasticemail.com. 3312 SOA dns41.cloudns.net. support.cloudns.net. 2026022305 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0