spf.mailanyone.net has no MX records.
Question and response
Question
dig spf.mailanyone.net. MX
Answer
The response has no answer records.
Authority
mailanyone.net. 3600 SOA dns1.p04.nsone.net. hostmaster.nsone.net. 1655836416 10000 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0