spf-d.jangomail.com has no MX records.
Question and response
Question
dig spf-d.jangomail.com. MX
Answer
The response has no answer records.
Authority
jangomail.com. 180 SOA ns11.constellix.com. dns.constellix.com. 2015010464 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0