_spf.wanex.net has no MX records.
Question and response
Question
dig _spf.wanex.net. MX
Answer
The response has no answer records.
Authority
_spf.wanex.net. 10800 SOA main.wanex.net. hostmaster.wanex.net. 2024061000 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0