spf.rmh1.net has no MX records.
Question and response
Question
dig spf.rmh1.net. MX
Answer
The response has no answer records.
Authority
rmh1.net. 180 SOA ns0.dnsmadeeasy.com. dns.dnsmadeeasy.com. 2008010182 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0