spf.hes.trendmicro.com has no MX records.
Question and response
Question
dig spf.hes.trendmicro.com. MX
Answer
The response has no answer records.
Authority
trendmicro.com. 300 SOA muc1-tmns3.sdi.trendnet.org. dnsadmin.trendmicro.com. 2007086612 900 300 86400 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0