secure-mail.be has no MX records.
Question and response
Question
dig secure-mail.be. MX
Answer
The response has no answer records.
Authority
secure-mail.be. 3600 SOA ns1.skynet.be. dnsmaster.skynet.be. 263 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0