spf.betrend.com has no MX records.
Question and response
Question
dig spf.betrend.com. MX
Answer
The response has no answer records.
Authority
betrend.com. 2560 SOA ns.jp.betrend.com. bt_mis.betrend.com. 1771315367 16384 2048 1048576 2560
Additional
The response has no additional records.